Emulsifying is the technique of forcing two liquids that normally repel each other—like oil and vinegar—into a stable, creamy mixture. It is the backbone of classic sauces such as hollandaise, vinaigrette, and aioli, and once you master the basic method, you can apply it to dozens of dishes. This article walks you through five reliable emulsions, from a quick blender mayonnaise to a warm beurre blanc, with exact ratios and step-by-step guidance so your sauces stay silky and never break.
Ingredients
Blender Mayonnaise
- 1 large egg (pasteurized if serving to vulnerable guests)
- 1 tbsp (15 ml) lemon juice
- 1 tsp (5 g) Dijon mustard
- 1/2 tsp (2 g) salt
- 1 cup (240 ml) neutral oil (grapeseed or canola)
Classic Vinaigrette
- 3 tbsp (45 ml) red wine vinegar
- 1 tsp (5 g) Dijon mustard
- 1/2 tsp (2 g) salt
- 1/4 tsp (1 g) black pepper
- 1/2 cup (120 ml) extra-virgin olive oil
Hollandaise Sauce
- 3 large egg yolks
- 1 tbsp (15 ml) water
- 1 tbsp (15 ml) lemon juice
- 1/2 cup (115 g) unsalted butter, melted and warm
- Pinch of cayenne pepper (optional)
- Salt to taste
Beurre Blanc
- 1/2 cup (120 ml) dry white wine
- 1/4 cup (60 ml) white wine vinegar
- 2 tbsp (30 g) finely chopped shallots
- 1/2 cup (115 g) cold unsalted butter, cut into small cubes
- Salt to taste
Simple Aioli (Garlic Mayonnaise)
- 1 large egg yolk (pasteurized if needed)
- 2 cloves garlic, finely grated
- 1 tbsp (15 ml) lemon juice
- 1/2 tsp (2 g) salt
- 3/4 cup (180 ml) olive oil (or half olive, half neutral)
Instructions
Blender Mayonnaise
- Place the egg, lemon juice, mustard, and salt in a blender. Blend on low for 5 seconds to combine.
- With the blender running on low, slowly drizzle in the oil through the lid opening in a thin, steady stream. It should take about 1 minute to add all the oil.
- Once all oil is added, blend for another 10 seconds. The mayonnaise should be thick and creamy. If it is too thin, blend for 10 more seconds.
- Transfer to a jar and refrigerate. Use within 1 week.
Classic Vinaigrette
- In a small bowl, whisk together vinegar, mustard, salt, and pepper until the salt dissolves.
- While whisking constantly, add the olive oil in a slow, steady stream. Continue whisking until the dressing is emulsified and slightly thickened.
- Use immediately, or store in a jar and shake well before using. The vinaigrette will separate on standing; that is normal.
Hollandaise Sauce
- Fill a medium saucepan with 1 inch (2.5 cm) of water and bring to a simmer over medium heat.
- In a heatproof bowl that fits over the saucepan without touching the water, whisk the egg yolks, water, and lemon juice together.
- Place the bowl over the simmering water. Whisk constantly for 2–3 minutes, until the yolks thicken and turn pale yellow. The mixture should reach 160°F (71°C) as a safe minimum for egg dishes.
- Remove the bowl from the heat. Slowly drizzle in the warm melted butter while whisking constantly. Start with a few drops, then increase to a thin stream.
- Continue whisking until all butter is incorporated and the sauce is thick and glossy. Season with salt and cayenne.
- Serve immediately, or keep warm in a thermos for up to 1 hour.
Beurre Blanc
- In a small saucepan, combine wine, vinegar, and shallots. Bring to a boil over medium-high heat.
- Reduce heat to medium and simmer until the liquid is reduced to about 2 tablespoons (30 ml), about 5–7 minutes.
- Reduce heat to low. Whisk in the cold butter cubes one at a time, waiting until each piece is almost melted before adding the next. The sauce should become creamy and thick.
- If the sauce gets too hot and starts to separate, remove from heat and whisk in a tablespoon of cold water.
- Strain out the shallots if desired, season with salt, and serve immediately.
Simple Aioli
- In a medium bowl, whisk together the egg yolk, garlic, lemon juice, and salt.
- Whisking constantly, add the oil drop by drop at first, then in a thin stream once the mixture starts to thicken.
- Continue whisking until all oil is incorporated and the aioli is thick and pale. If it becomes too thick, whisk in a teaspoon of water.
- Refrigerate for at least 30 minutes to allow the garlic flavor to mellow. Use within 3 days.
Tips
- Temperature matters: For hollandaise and beurre blanc, keep the butter warm but not hot. If the butter is too hot, it will cook the eggs and break the sauce. If too cold, it will seize.
- Add oil slowly: The most common cause of a broken emulsion is adding oil too quickly. Start with a few drops and only increase to a stream once the mixture visibly thickens.
- Fix a broken sauce: If your emulsion splits, place a fresh egg yolk in a clean bowl and slowly whisk in the broken sauce, a teaspoon at a time, until it comes back together.
- Use room-temperature eggs: Cold eggs are harder to emulsify. Let eggs sit out for 15 minutes before starting.
Serving Suggestions
- Blender mayonnaise: Use as a base for coleslaw, potato salad, or as a spread for sandwiches.
- Vinaigrette: Toss with mixed greens, roasted vegetables, or grilled chicken.
- Hollandaise: Serve over poached eggs for eggs Benedict, or with steamed asparagus.
- Beurre blanc: Spoon over grilled fish, shrimp, or roasted chicken.
- Aioli: Serve with crudités, grilled vegetables, or as a spread on a burger.
Variations
- Herb vinaigrette: Add 1 tbsp (5 g) chopped fresh herbs (parsley, chives, tarragon) to the vinaigrette after emulsifying.
- Spicy aioli: Stir in 1 tsp (5 ml) sriracha or a pinch of cayenne to the finished aioli.
- Lemon hollandaise: Replace the water with an extra tablespoon of lemon juice for a tangier sauce.
- Béarnaise sauce: Add 1 tbsp (5 g) chopped tarragon and 1 tsp (2 g) chopped chervil to the hollandaise along with a splash of white wine vinegar instead of lemon.
Storage and Reheating
- Mayonnaise and aioli: Store in an airtight container in the refrigerator for up to 1 week (mayonnaise) or 3 days (aioli). Do not freeze.
- Vinaigrette: Store in a jar in the refrigerator for up to 2 weeks. Shake well before each use. It will separate; that is normal.
- Hollandaise and beurre blanc: These are best served fresh. If you must make ahead, keep them warm in a thermos for up to 1 hour. Do not refrigerate and reheat, as they will break.
- Reheating: For mayonnaise or aioli, do not reheat. For vinaigrette, bring to room temperature and shake. For hollandaise or beurre blanc, gently warm in a double boiler over low heat, whisking constantly, adding a teaspoon of water if needed.
Frequently Asked Questions
Why did my mayonnaise turn out thin?
This usually happens when the oil is added too quickly or the blender is not running fast enough. The emulsion needs constant motion to incorporate the oil. If it stays thin, try blending longer; if it still does not thicken, start over with a fresh egg and slowly whisk in the thin mixture.
Can I use olive oil for mayonnaise?
Yes, but extra-virgin olive oil has a strong flavor and can make the mayonnaise bitter. Use a mild olive oil or mix half olive oil with half neutral oil for a balanced taste.
How do I fix a broken hollandaise?
Place a fresh egg yolk in a clean bowl. Whisking constantly, slowly add the broken sauce a teaspoon at a time. Once it starts to thicken, you can add the rest in a slow stream. This rescue method works for most emulsions.
Can I make hollandaise ahead of time?
Yes, but it needs to be kept warm. Pour the finished sauce into a thermos and it will stay at serving temperature for up to 1 hour. Do not let it cool and reheat, as it will separate.
Is it safe to use raw eggs in mayonnaise and aioli?
Raw eggs carry a risk of salmonella. To reduce risk, use pasteurized eggs, which are heat-treated to kill bacteria. For pregnant people, young children, older adults, and anyone with a weakened immune system, pasteurized eggs are the safest choice.
What is the best oil for emulsified sauces?
Neutral oils like canola, grapeseed, or light olive oil work best because they do not overpower the other flavors. For vinaigrettes, extra-virgin olive oil adds flavor, but use it in moderation if you want a delicate balance.
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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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