Grilled London Broil with Crab (Recipe Ideas)
For grilled London broil with crab, marinate a lean beef cut in the refrigerator, pat it dry, and sear it over a hot grill. Rest the beef, then slice it thinly across the grain. Warm cooked crab gently with garlic butter in a separate pan, and spoon it over the slices just before serving.
A lean steak can go from juicy to tough in a short time, and crab can lose its soft texture if it boils in butter. That makes timing the key to this meal. Cook the beef first, prepare the topping while it rests, and bring the two together at the table.
I keep the flavors simple so the beef still tastes like beef: a savory marinade, a bright squeeze of lemon, and a modest amount of crab butter. The method works on a standard gas or charcoal grill, with a grill-safe cast-iron skillet or grate for a strong sear. A thermometer takes guesswork out of doneness.
Material Setup and London Broil Prep
This setup keeps the beef, crab, and cookware suited to their jobs. London broil is a cooking style often made with a lean beef cut, such as top round; the exact cut can vary by store. A short refrigerator marinade adds flavor, while careful drying helps the surface brown.
Ingredients for four servings
- 1½ to 2 pounds lean London broil cut, about 1 to 1½ inches thick
- 2 tablespoons olive oil
- 2 tablespoons soy sauce
- 1 tablespoon Worcestershire sauce
- 1 tablespoon lemon juice or red wine vinegar
- 1 teaspoon Dijon mustard
- 2 garlic cloves, minced
- ½ teaspoon black pepper
- 8 ounces cooked crab meat, picked over for shell
- 4 tablespoons butter
- 1 small garlic clove, finely minced
- 1 to 2 teaspoons lemon juice, plus wedges for serving
- 1 tablespoon chopped parsley, optional
Use a glass or stainless-steel bowl or a food-safe bag for the marinade. Place the beef in it, turn to coat, cover, and refrigerate for 2 to 8 hours. Do not marinate on the counter. A long soak is not needed for this recipe, and the lemon or vinegar makes it especially important to keep the beef chilled.
Before grilling, lift out the beef and discard the used marinade. If you want to use it as a sauce, boil it thoroughly first. Pat the meat dry with paper towels. A wet surface steams before it browns, so drying is a small step with a clear payoff. Lightly coat the beef with refined avocado oil or another refined, high-smoke-point oil. Smoke point varies by brand; refined avocado oil is often listed near 500°F (260°C).
| Item | Use it for | What to check |
|---|---|---|
| Grill-safe cast-iron grate or skillet | Searing beef | Confirm the item is rated for grill heat |
| Stainless-steel pan | Warming crab butter | Best choice for lemon or other acidic sauce |
| Instant-read thermometer | Checking beef and crab | Measure the thickest part of the beef |
| Refined high-smoke-point oil | Lightly coating beef | Avoid relying on a heavy coat of oil on the grate |
Cast iron and stainless steel can work over grill heat if the maker rates the specific item for it. Avoid PTFE-coated cookware over direct grill heat, and check cookware instructions for temperature limits. Never put cold water on hot cast iron; a sudden temperature change can crack or warp it. The next step is to heat the grill and cook the beef before warming the crab.
Grilling, Crab Topping, and Doneness
The goal is a browned outside and a safely cooked center, without leaving the beef over direct heat longer than needed. Heat the grill to 450–500°F (232–260°C). If using a cast-iron skillet or grate, let it preheat gradually for 5–8 minutes, following its care instructions.
Set up a direct-heat area for searing and, if possible, a cooler indirect-heat area for finishing. Place the beef over direct heat. Turn it as needed to brown both sides; the total time depends on thickness, grill heat, and the cut. Do not use time alone to decide when it is done. If the outside is browning fast but the center is still below your target, move the steak to indirect heat.
Check the thickest point with a food thermometer. For whole-muscle beef, USDA guidance is a minimum internal temperature of 145°F (63°C), followed by a rest of at least 3 minutes. Lower doneness targets are culinary choices, not USDA’s safety minimum. If you choose one, understand that it falls below that recommended safety temperature.
While the beef rests, make the crab topping in a separate stainless-steel pan. Melt the butter over low heat, add the garlic, and stir just until fragrant. Add the crab and fold it gently through the butter. Add lemon juice to taste, but do not boil the mixture. Prolonged heating can make crab tough. If reheating previously cooked crab meat or leftover crab topping, heat it to 165°F (74°C), checking with a thermometer.
| What you see or measure | What to do |
|---|---|
| Beef browns before the center reaches your chosen temperature | Move it to indirect heat and keep checking |
| Beef reaches 145°F (63°C) | Rest for at least 3 minutes for USDA guidance |
| Crab topping is leftover and being reheated | Heat to 165°F (74°C), then serve |
| Butter bubbles hard or crab simmers | Lower the heat and stir gently |
I make the topping during the rest rather than while the steak is still over the flame. That keeps attention on the beef when it needs it, and gives the crab only a brief warm-up. Keep acidic lemon or wine sauces in stainless steel, not simmering in bare cast iron, where acid can harm the seasoning and add a metallic taste. Once both parts are ready, slice and plate promptly.
Cleaning and Cast-Iron Seasoning Care
Cast iron needs a little care after grilling, especially if acidic ingredients touched it. Clean the cookware after it has cooled enough to handle, and follow the maker’s directions. Avoid sudden temperature changes, which can damage hot cast iron. Keep crab butter and lemon sauce in stainless steel to protect the pan’s seasoning.
If the grill is still hot, do not pour cold water onto a cast-iron grate or skillet. Let it cool gradually. Remove food residue with a suitable brush or scraper, then clean and dry the cast iron according to its care instructions. A thin layer of oil may be appropriate for some cast-iron cookware, but follow the manufacturer’s guidance for the specific item.
If butter drips onto a grill, let the grill cool enough to clean safely and use the grill maker’s cleaning directions. Do not use aerosol cooking sprays on nonstick cookware; their additives can leave a hard-to-remove film. For this recipe, brush or rub a little oil onto the beef instead of spraying the cooking surface. Clean stainless steel according to its own instructions, too.
A useful kitchen check is to ask what touched the hot surface: beef and oil suit the grill, while crab butter and lemon belong in the stainless-steel pan. That separation makes cleanup simpler and helps prevent acidic sauce from sitting in cast iron.
Slicing, Plating, and Dining Presentation
London broil is best served in thin slices cut across the grain. The grain is the direction the muscle fibers run; cutting across those fibers shortens them, making each piece easier to chew. Rest the steak for at least 3 minutes, then look for the lines in the meat and slice perpendicular to them.
Transfer the slices to a warm platter and spoon the crab butter over the top. Keep some crab visible rather than burying the beef in sauce. Add parsley and lemon wedges if you like. This lets diners add more brightness at the table without making the whole dish sharp or buttery.
For an easy dinner, serve with a green salad, steamed green beans, or potatoes. If you want a richer plate, offer crusty bread to catch the butter. Keep any extra crab topping warm, not boiling, and serve it soon after preparation.
Practical grill scenarios
These are common setup situations, not fixed cooking times. Grill heat and steak thickness vary, so use the thermometer rather than copying a time from another grill.
- Gas grill with a cast-iron grate: Preheat to 450–500°F, sear over direct heat, then move the steak to an unlit burner if the outside gets ahead of the center.
- Charcoal grill with a stainless-steel pan: Keep the pan over lower or indirect heat while melting the butter. Add crab near serving time, not while the grill is at its hottest.
- One-zone grill: Sear the beef, then reduce the heat if your grill allows it. If you cannot create a cooler area, keep checking the center temperature closely and remove the steak when it reaches your chosen target.
The reliable sequence is simple: prep and dry the beef, sear and check it, rest and slice it, then warm the crab topping. Following that order helps keep the beef browned and the crab tender.
Recipe Ideas and Easy Variations
The base recipe pairs lean beef with garlic, butter, and crab. Small changes can shift the flavor without changing the cooking method. Keep the crab topping gentle, and add strong flavors in measured amounts so they do not mask the beef.
- Lemon-parsley crab butter: Use the listed recipe, adding extra parsley and lemon at the end.
- Chive and black pepper: Fold chopped chives into the warm butter and finish with cracked black pepper.
- Mild heat: Add a pinch of red pepper flakes to the butter as the garlic warms.
- Mustard-forward beef: Add another teaspoon of Dijon to the marinade, while keeping the crab topping lemony and light.
- Wine and butter: Replace some lemon juice in the topping with a small splash of wine, but warm it in stainless steel and avoid a long simmer.
If you are serving people with different tastes, plate the beef first and offer crab butter on the side. This is also a useful option for anyone who prefers less butter or wants to control the amount of crab. Do not return leftover topping that has been served to the pan unless you can safely reheat it to 165°F.
Frequently Asked Questions
These answers cover the main choices that affect a grilled London broil with crab: marinating, heat, doneness, crab texture, and cookware. Use them as quick checks while cooking, but follow the USDA temperature guidance and the instructions for your grill and cookware.
What cut of beef is used for London broil?
The name can refer to a preparation method rather than one exact cut. Stores may label lean cuts such as top round as London broil, so check the package or ask the butcher.
How long should I marinate London broil?
Marinate it in the refrigerator for 2 to 8 hours. Keep it covered, and discard the raw-beef marinade unless you boil it thoroughly before using it as a sauce.
What grill temperature works for London broil?
Preheat the grill to 450–500°F (232–260°C) for a hot sear. Move the beef to indirect heat if the outside browns before the center reaches your chosen temperature.
What is the USDA safe temperature for whole-muscle beef?
USDA guidance calls for 145°F (63°C) internally, followed by a rest of at least 3 minutes. Check the thickest part with a thermometer.
How do I keep crab meat from getting tough?
Warm cooked crab gently in butter over low heat and do not boil it. If reheating previously cooked crab or leftover topping, heat it to 165°F (74°C).
Can I cook the crab topping in cast iron?
Use stainless steel for the crab butter, especially if it contains lemon or wine. Acidic sauces left in bare cast iron can damage its seasoning and take on a metallic taste.
Can I use a cast-iron skillet on the grill?
Yes, if that specific skillet is rated for grill heat. Preheat it gradually for 5–8 minutes, and check the manufacturer’s temperature and care instructions.
How should I slice London broil?
Rest it for at least 3 minutes, then slice thinly across the grain. Cutting across the visible muscle fibers helps make the slices easier to chew.
Can I prepare the crab butter ahead?
You can make it ahead and refrigerate it, then reheat it gently. Bring previously cooked crab or crab topping to 165°F (74°C) when reheating, and avoid prolonged heating.
What should I serve with beef and crab?
Try green beans, a green salad, potatoes, or bread. These simple sides complement the beef and crab without requiring another elaborate dish.
The best version of this meal depends less on extra ingredients than on good timing. Dry the beef for browning, use a thermometer, rest and slice across the grain, and warm the crab separately. With those steps in place, the steak stays the center of the plate and the crab adds a buttery finish.
(This article was written by one of our staff writers, Steven R. Bancroft. Visit our Meet the Team page.)
