Peanut Oil Mayonnaise (Emulsion Recipe)
Make a smooth peanut-oil mayonnaise by blending one pasteurized egg with lemon juice or vinegar, Dijon mustard, salt, and refined peanut oil. Keep the ingredients near room temperature for easier blending, but do not heat anything. Blend until thick, then refrigerate at or below 4°C (40°F) and use within 3–4 days.
Making mayonnaise at home takes no stove time, so it can save a little energy and keep the kitchen cooler than a cooked sauce would. The key is not heat, though. It is getting oil and egg to combine into a stable emulsion, then handling the egg safely. In cooking lessons, I often see people pour in oil too fast or mistake a failed emulsion for a bad recipe. A measured method makes both problems easier to avoid.
Material Setup & Ingredient Preparation
This mayonnaise uses a clean, dry container and ingredients measured before blending. A stable setup helps the blender work evenly and limits splashes. Room-temperature ingredients can make blending convenient, but they do not make raw egg safe. Use a pasteurized egg, and keep the finished sauce cold.
Ingredients and equipment
An emulsion is a mixture of tiny droplets of one liquid spread through another. Here, the blender breaks peanut oil into small droplets and disperses them through the egg mixture. Egg yolk contains natural emulsifiers that help hold those droplets in place, giving the mayonnaise its thick texture.
For about 300 grams of mayonnaise, measure:
- 1 large pasteurized egg, about 50 g
- 15 g lemon juice or vinegar
- 5 g Dijon mustard
- 225 g refined peanut oil
- About 2 g fine salt
Use a narrow, stable blending cup that fits the immersion-blender head. Glass, stainless steel, or food-grade plastic are suitable choices. Avoid reactive aluminum or copper bowls, especially when using acidic ingredients such as lemon juice or vinegar. No pan, heating, or preheating is needed.
A scale gives the most repeatable results. If you do not have one, use a measuring spoon for the smaller ingredients and follow your oil bottle’s volume marks, but remember that grams and milliliters are not always interchangeable for every ingredient.
Ingredient temperature and oil choice
Ingredients around 18–22°C (64–72°F) are convenient to blend. If the egg is cold, let it sit out briefly while you measure the other ingredients. This is a blending preference, not a food-safety step. Do not leave egg or finished mayonnaise out for an extended time.
Refined peanut oil has a mild flavor that works well in mayonnaise. Unrefined peanut oil has a stronger flavor, and its smoke point varies and is generally lower. Smoke point describes when heated oil begins to smoke; it is not a target for this recipe. The oil is not heated, and smoke point does not tell you how to store the finished sauce.
Emulsification Technique & Execution
The goal is to disperse the oil gradually enough to form a smooth, thick mixture. An immersion blender makes this quick when its head starts at the bottom of the cup. With a whisk, the same principle applies: add oil in a thin stream while whisking steadily.
Immersion-blender method
- Wash your hands and make sure the blender, cup, and utensils are clean and dry. Measure all ingredients and confirm that the egg is pasteurized.
- Put the egg, lemon juice or vinegar, mustard, and salt in the cup. Pour in the peanut oil.
- Set the immersion-blender head flat on the bottom of the cup. Keep it there and blend for about 10–15 seconds.
- Watch for the mixture at the bottom to turn opaque and thicken. Then raise the blender slowly so it draws in the oil above.
- Continue until the mixture looks uniform and thick, usually within 30–60 seconds total. Stop when no clear layer of oil remains.
Keep the cup steady and the blender head submerged as you work. Lifting too soon can pull air into the mixture or leave oil unincorporated. If the cup is wide or the blender head does not fit snugly, a narrower cup may help the ingredients circulate more evenly.
Whisk method
For hand-whisked mayonnaise, start with the egg, acid, mustard, and salt in a bowl. Whisk them together, then add the oil drop by drop at first. Once the mixture begins to thicken, add the rest in a slow, steady stream while whisking continuously.
This method takes more time and effort than an immersion blender, but it gives you close control over the oil flow. If your arm tires, pause briefly rather than pouring in a large amount to catch up. A rapid addition can overwhelm the mixture and make it split.
Adjusting texture and flavor
Taste the finished mayonnaise with a clean spoon. Add salt or acid in small amounts, then blend briefly to mix. If it is too thick, blend in cold water one teaspoon at a time until it loosens. Add gradually; a little water can change the texture quickly.
A thicker result is useful for spreading, while a looser one may suit a dip or dressing. The exact texture can vary with the egg, oil, and blending method. Adjust only after the emulsion has formed, so you can judge its flavor and thickness accurately.
| What you notice | Likely cause | What to do |
|---|---|---|
| Oil remains on top | The mixture has not emulsified fully | Keep the blender at the bottom briefly, then raise it slowly |
| Mayonnaise is too thick | The mixture needs a little liquid | Blend in cold water, one teaspoon at a time |
| Mixture looks split or oily | The emulsion has broken | Start with a fresh yolk in a clean cup; slowly blend the split mixture into it |
| Flavor seems flat | Salt or acid may be low | Add a small amount, taste, and blend briefly |
If the mayonnaise breaks, do not keep adding oil or water at random. Put a fresh egg yolk in a clean cup and blend it. Then add the split mixture slowly, as if it were the oil, until the new emulsion thickens. This recovery method uses another egg, so keep the same pasteurized-egg and refrigeration precautions.
Food Safety, Storage & Cleaning
Homemade mayonnaise contains egg and should be treated as a perishable food. Pasteurized egg lowers the risk associated with raw egg, but it does not make the sauce shelf-stable. Refrigerate the finished mayonnaise promptly at or below 4°C (40°F), and use it within 3–4 days.
Egg safety and refrigeration
Raw, unpasteurized egg can carry Salmonella. Lemon juice or vinegar in this recipe is not a validated pasteurization step, and the recipe does not establish a verified finished pH. Do not rely on the acid to make an unpasteurized egg safe.
Use pasteurized egg, especially when serving people at higher risk from foodborne illness. Another option is commercial mayonnaise made with pasteurized egg. Keep the homemade batch covered and refrigerated, and return it to the refrigerator after serving rather than leaving it out for an extended period.
The 18–22°C (64–72°F) ingredient range is for convenient blending only. It is not a safety threshold. Likewise, the smoke point of peanut oil has no bearing on the mayonnaise’s safe storage time.
Cleaning and handling
Transfer the finished sauce to a clean, covered container and refrigerate it right away. Labeling it with the preparation date can help you track the 3–4-day use period. Discard it after that period rather than judging safety by smell or appearance alone.
Wash the cup, blender head, whisk, and any utensils that touched raw egg or mayonnaise with hot water and detergent. Clean hands and work surfaces as well. Do not leave egg-contaminated tools or the sauce at room temperature while you finish other kitchen tasks.
Serving, Pairing & Dining Presentation
Peanut-oil mayonnaise is a rich, creamy sauce with a flavor shaped by the oil, acid, mustard, and salt. Its mild or more pronounced peanut character depends on whether the oil is refined or unrefined. Serve a small portion at a time, and keep the rest chilled until needed.
Choose a flavor direction
Refined peanut oil usually gives a more neutral base, allowing the lemon or vinegar and mustard to stand out. Unrefined oil can bring a stronger peanut flavor, so it may suit dishes where that taste is welcome. Since flavor varies by product, taste the oil before making a full batch if you are unsure.
The sauce can be served as a spread or dip, or used as a base for a simple dressing. For a thinner dressing, blend in cold water a teaspoon at a time. Add other seasonings in small amounts, and keep any additions food-safe and refrigerated with the mayonnaise.
Plan portions and service
The recipe makes about 300 g, or roughly one small container. If you need less, make a smaller batch only if your blender can still reach and circulate the ingredients in the cup. A batch that is too shallow for the blender head may be harder to emulsify.
For a meal, portion only what you expect to use and keep the main container cold. This avoids repeated warming and handling. The mayonnaise should remain at or below 4°C (40°F) when stored; do not use oil smoke-point figures as a guide to serving or storage.
Frequently Asked Questions
These quick answers cover the most common questions about making, fixing, and storing homemade peanut-oil mayonnaise. The same core rules apply throughout: use a pasteurized egg, add or incorporate oil with control, and refrigerate the finished sauce promptly.
Can I use unrefined peanut oil?
Yes. It can give the mayonnaise a stronger peanut flavor. Its smoke point varies, but no oil heating is used in this recipe.
Does the egg need to be at room temperature?
No. Ingredients around 18–22°C (64–72°F) are convenient for blending, but that temperature is not a safety control.
Can I make this without an immersion blender?
Yes. Whisk the egg mixture and add the oil drop by drop at first, then in a slow stream as it thickens.
Why did my mayonnaise stay runny?
The oil may not have been incorporated, or the blender may not have drawn the ingredients together. Keep the head at the bottom briefly, then raise it slowly.
How can I fix split mayonnaise?
Blend a fresh yolk in a clean cup, then slowly blend the split mixture into it until it thickens.
Can lemon juice or vinegar make an unpasteurized egg safe?
No. The acid amount here is not a validated pasteurization step and does not establish a verified finished pH.
How long does homemade mayonnaise keep?
Keep it covered at or below 4°C (40°F) and use it within 3–4 days.
Can I freeze it?
Freezing is not part of this recipe’s storage guidance. For the stated method, refrigerate the sauce and use it within 3–4 days.
Does the oil’s smoke point matter?
No. The oil is not heated. Smoke point is not a food-safety or storage limit for mayonnaise.
What should I use if someone eating it is at higher risk from foodborne illness?
Use pasteurized egg or choose commercial mayonnaise made with pasteurized egg.
(This article was written by one of our staff writers, Daniel M. Whitaker. Visit our Meet the Team page.)
