An emulsifying agent is the key to stable, creamy sauces, dressings, and mayonnaise. This recipe shows you how to make a versatile, neutral-tasting emulsion base using egg yolk and mustard, which naturally contain lecithin and mucilage to bind oil and water together. It works because the yolk and mustard physically surround tiny droplets of oil, preventing them from separating, and the result is a smooth, thick emulsion you can flavor any way you like.
Ingredients
- 1 large egg yolk (about 18 g)
- 1 teaspoon (5 g) Dijon mustard
- 1 tablespoon (15 ml) lemon juice or white wine vinegar
- 1/4 teaspoon (1.5 g) fine sea salt
- 1/2 cup (120 ml) neutral oil, such as grapeseed or canola
- 1–2 tablespoons (15–30 ml) water, if needed
Instructions
- In a medium bowl, whisk the egg yolk, mustard, lemon juice, and salt together until well combined and slightly frothy.
- Begin adding the oil drop by drop, whisking constantly. After about 1 tablespoon (15 ml) of oil has been incorporated, the mixture will start to thicken and look creamy.
- Once the emulsion has formed, you can add the remaining oil in a slow, steady stream while whisking continuously. Do not pour too quickly, or the emulsion will break.
- If the mixture becomes too thick to whisk, add 1–2 teaspoons (5–10 ml) of water to loosen it, then continue adding oil.
- Once all the oil is incorporated, taste and adjust seasoning with more salt or acid if desired. The emulsion should be thick, glossy, and spoonable.
- Use immediately or refrigerate in an airtight container.
Tips
- Temperature matters: All ingredients should be at room temperature (about 70°F / 21°C) before starting. Cold ingredients make it harder for the emulsion to form.
- Rescue a broken emulsion: If the mixture separates, whisk a fresh egg yolk in a clean bowl, then slowly whisk the broken mixture into it, a teaspoon at a time, until it comes back together.
- Substitute the mustard: If you don’t have Dijon, use 1/4 teaspoon dry mustard powder or 1/2 teaspoon yellow mustard. The flavor will be slightly different, but the emulsifying power is similar.
- Use a blender for larger batches: For more than 1 cup (240 ml) of oil, use an immersion blender or regular blender. Add all ingredients except oil, then with the blender running, slowly drizzle in the oil.
Serving Suggestions
Use this emulsion as a base for creamy salad dressings (add herbs, garlic, or anchovy paste), as a spread for sandwiches, or as a dip for crudités. It also makes an excellent base for homemade aioli—just add minced garlic and a pinch of cayenne. For a lighter sauce, fold in a spoonful of yogurt or sour cream just before serving.
Variations
- Herb emulsion: Add 2 tablespoons (8 g) finely chopped fresh parsley, chives, or dill after the emulsion forms.
- Spicy emulsion: Stir in 1 teaspoon (5 ml) sriracha or 1/2 teaspoon (1 g) chipotle powder.
- Citrus emulsion: Replace the lemon juice with an equal amount of lime juice and add 1/2 teaspoon (1 g) lime zest.
- Vegan version: Use 2 tablespoons (30 g) aquafaba (chickpea water) instead of egg yolk, and increase the mustard to 1 1/2 teaspoons (7.5 g). The texture will be slightly lighter, but it will still emulsify.
Storage and Reheating
Store the emulsion in an airtight container in the refrigerator for up to 3 days. It will thicken as it chills; let it sit at room temperature for 10–15 minutes before using, then whisk in a teaspoon of water if needed. Do not freeze, as the emulsion will break upon thawing. If you are using raw egg yolk, note that the USDA recommends consuming raw egg products within 2 days for safety.
Frequently Asked Questions
Why did my emulsion break?
An emulsion breaks when oil is added too quickly, when ingredients are too cold, or when the mixture is not whisked enough. Start over with a fresh yolk and slowly whisk the broken mixture into it—this usually rescues it.
Can I use olive oil instead of neutral oil?
Yes, but extra-virgin olive oil has a strong flavor and can make the emulsion taste bitter. Use a mild olive oil or blend half olive oil and half neutral oil for a more balanced taste.
Is it safe to eat raw egg yolk?
Raw egg yolk carries a small risk of salmonella. To reduce risk, use pasteurized eggs, which are heat-treated to kill bacteria. Pregnant people, young children, older adults, and anyone with a weakened immune system should choose pasteurized eggs or a vegan alternative.
Can I make this without mustard?
Yes, but mustard contains mucilage that helps stabilize the emulsion. If you omit it, use an extra egg yolk or add 1/2 teaspoon (2 g) of lecithin powder to maintain stability.
How do I know if the emulsion is ready?
The mixture will change from a thin, liquid state to a thick, creamy, and glossy texture. When you lift the whisk, the emulsion should fall off in a slow ribbon rather than dripping quickly.
Can I double this recipe?
Yes, but it is easier to make in batches rather than doubling in one bowl, especially if whisking by hand. If using a blender, you can double it, but add the oil slowly and keep the blender running.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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