Butter Mayonnaise Spread (Emulsion Recipe)
This chilled spread combines mayonnaise’s egg-yolk emulsion with clarified butter for a rich, firm texture. Whisk a pasteurized yolk with mustard, lemon juice, and salt, then slowly add neutral oil and fluid clarified butter at 30–35°C. Chill promptly, keep at or below 4°C, and use within three days; it is perishable, not shelf-stable.
Across U.S. home kitchens, a warm room can make this recipe harder to manage, especially in summer. The key is not a hot pan or a high-speed whisk. It is controlling the butter’s temperature and adding both fats gradually. Once you know what to look for, you can make a smooth spread without guessing.
What this butter-enriched spread is
This is a chilled emulsion: tiny droplets of fat are held together in a stable mixture with help from egg yolk and mustard. Clarified butter adds a buttery flavor, while neutral oil keeps the mixture soft enough to spread. The finished condiment is rich and perishable, so it needs prompt chilling.
Mayonnaise usually relies on oil dispersed through an egg-based mixture. Here, part of that oil is replaced with clarified butter, which is butter with most of its water and milk solids removed. The result sets more firmly in the refrigerator than oil-only mayonnaise, but should remain spoonable.
The recipe is useful for sandwiches, vegetable dipping, and cooled seafood. It is not a cooking fat or a shelf-stable condiment. Keep it chilled, and do not heat it to soften it; warming can cause separation and raises food-safety concerns.
The quantities below produce roughly 145 g by ingredient weight, depending on the size of the yolk and how much stays in the bowl. That is about 10–12 modest servings. A stated yield near 180 g would not match these ingredient quantities by weight.
Ingredients and preparation
Good preparation makes the emulsion easier to build. Use a clean, dry glass or food-grade stainless-steel bowl and whisk, or a clean immersion-blender cup. Have the ingredients ready before you begin so the butter does not cool and set while you work.
| Ingredient | Amount | Purpose |
|---|---|---|
| Pasteurized egg yolk | 1, about 18 g | Helps hold the emulsion |
| Dijon mustard | 1 tsp, about 5 g | Adds flavor and supports mixing |
| Lemon juice or white-wine vinegar | 1 tsp, about 5 g | Adds acidity and brightness |
| Neutral oil | 60 ml | Keeps the spread soft and mild |
| Clarified butter | 60 g | Adds buttery flavor and body |
| Fine salt | ¼ tsp | Seasons the mixture |
Choose a neutral oil with a mild taste, such as a plain vegetable or canola oil. Use pasteurized egg yolk because this is an uncooked preparation. Keep the yolk and bowl near 18–22°C, and make sure your utensils are clean and dry.
Clarify and cool the butter
Clarified butter is melted butter separated from most of its water and milk solids. For this spread, it must be fluid enough to pour but cool enough not to warm the yolk. Aim for 30–35°C when adding it.
Melt butter gently, then let it settle so the clear fat separates from the milk solids and water. Pour off the clear fat, leaving the solids behind. Cool it until fluid but no longer hot; a thermometer is the most reliable way to check.
Butter that is too hot can warm the yolk and destabilize the mixture. Butter that is too cool may start to set as it enters the bowl, leaving small grains. If it begins to thicken, warm it gently just until fluid, then check its temperature again.
How to make the spread
The emulsion forms when you add fat in small amounts while whisking the yolk mixture. Start with drops of neutral oil, then move to a thin stream once the base thickens. Add the clarified butter just as slowly, keeping it fluid and within the target temperature range.
- Set up. Check that the bowl, whisk, and ingredients are clean. Bring the egg and bowl near 18–22°C, and have the butter at 30–35°C.
- Mix the base. Whisk the yolk, Dijon, lemon juice or vinegar, and salt until smooth and uniform.
- Add the oil drop by drop. Whisk steadily as you add a few drops at a time. At first, the mixture may look loose. Continue until it begins to thicken.
- Switch to a thin stream. Once the mixture is thicker, pour in the remaining oil slowly while whisking. Keep the stream narrow and steady rather than pouring it all at once.
- Add the butter slowly. Whisk in the fluid clarified butter in a thin stream. Watch the mixture as you work. If it starts to look greasy or separated, stop adding fat.
- Taste and chill. Adjust the salt or acidity to taste. Transfer the spread to a covered container and refrigerate promptly for at least 30 minutes before serving.
A smooth, cohesive mixture is the sign that the fat is being incorporated. If the bowl is too warm or the butter too hot, the spread may look oily. If the butter is too cool, you may see pale grains as it begins to set. Slow addition gives you time to notice either problem.
Choosing a whisk or immersion blender
A whisk gives you direct control over the pace of the emulsion and makes it easy to pause. A clean immersion-blender cup is another option, but the fat still needs to be added gradually. In either case, temperature and steady incorporation matter more than speed alone.
For a first batch, hand-whisking can make the changes in texture easier to see. If using an immersion blender, follow the tool maker’s directions and use a clean cup. Do not assume blending can fix butter that is too hot or an emulsion that has already turned greasy.
Troubleshooting a broken or grainy spread
A broken emulsion looks oily or separated instead of creamy. A grainy spread often means the butter began to set before it blended in. Stop adding fat as soon as you spot a problem; continuing to pour may make separation worse.
| What you see | Likely cause | What to do |
|---|---|---|
| Thin mixture that has not thickened | Fat was added too quickly early on | Pause, whisk the base, then continue with drops |
| Greasy surface or clear oil | Fat was added too fast, or the mixture warmed | Stop adding fat; do not heat the mixture |
| Small pale grains | Butter was too cool or began setting | Pause; gently warm the butter separately until fluid, then resume only if the mixture is still cohesive |
| Spread is very firm after chilling | Clarified butter firms as it cools | Let a small serving stand briefly before spreading |
| Flavor seems flat | It may need more salt or acid | Adjust in small amounts and taste again |
Do not try to rescue a broken emulsion by heating it. Heat can worsen separation, and this spread is meant to be served chilled. If the mixture remains separated or you are unsure it was handled safely, discard it rather than serving it.
Safe storage and serving
This spread contains uncooked egg yolk and must be treated as a perishable food. Use pasteurized yolk, refrigerate the finished spread at or below 4°C, and keep it covered. Use it within three days, and discard it if temperature control or handling is uncertain.
Do not leave it out for more than two hours total, or more than one hour when the temperature is above 32°C. For a meal, serve a small portion and return the rest to the refrigerator promptly. A chilled serving dish can help keep the portion cool.
Wash bowls, utensils, and other food-contact tools promptly with hot detergent solution, rinse, and air-dry. Clean and sanitize tools used with the raw egg mixture before using them for other ready-to-eat food. Do not reuse an unwashed spoon for the finished spread.
Serve it chilled on sandwiches, as a dip with vegetables, or alongside cooled seafood. Chopped herbs or a little citrus zest can add flavor. For easier spreading, take out only the portion you need and let it temper briefly; return leftovers to the refrigerator without delay.
Frequently asked questions
These answers cover the recipe’s main choices, texture problems, and food-safety limits. The central rule is to add fat slowly, control the butter’s temperature, and keep the finished spread cold. Small changes in texture are normal as the butter cools.
Can I use regular melted butter instead of clarified butter?
Use clarified butter for this method. Regular butter contains water and milk solids, which can affect the texture and make the emulsion less predictable.
Why must the butter be 30–35°C?
At that temperature, clarified butter should be fluid but not hot. Hot butter can warm the yolk and destabilize the emulsion; cooler butter may start to form grains.
Can I use an unpasteurized egg yolk?
No. Because the spread is not cooked, use pasteurized egg yolk and keep the mixture refrigerated.
Can I use a different acid?
Yes. Use one teaspoon of lemon juice or white-wine vinegar. Taste after mixing and adjust in small amounts if you want more brightness.
Why is my spread grainy?
The clarified butter may have been too cool and started to set as it was added. Keep it fluid at 30–35°C and whisk it in gradually.
How long should I chill the spread before serving?
Chill it for at least 30 minutes. This helps the butter-enriched mixture set into a spreadable texture.
How long does it keep?
Keep it covered at or below 4°C and use it within three days. Discard it if it was left out too long or you are unsure how it was handled.
Can I leave it on the table during a meal?
Only briefly. Do not leave it out longer than two hours total, or one hour when the temperature is above 32°C. Serve a small portion and refrigerate the rest promptly.
(This article was written by one of our staff writers, Daniel M. Whitaker. Visit our Meet the Team page.)
