Add the whole 1 large egg, 2 teaspoons white wine vinegar, 1 teaspoon Dijon Mustard, 1 teaspoon lemon juice, and ¼ teaspoon sea salt to a tall jar or the jar of your immersion blender. Pour in the 1 cup avocado oil and let it settle for a few seconds.
Slowly insert your immersion blender into the jar or container, making sure it sits at the bottom. Try to sit it over the egg yolk.
Turn on the blender and blend for about 12-15 seconds, until the ingredients emulsify. Hold the blender firmly without moving it at first.
Move the immersion blender up and down slowly.
Continue blending until the mixture is thick and creamy.
Adjust the taste at this point if needed. You may add more lemon juice, sugar, or a bit more salt. Transfer the mayonnaise into a lidded jar or airtight container and store in the fridge for up to one week.
Notes
This recipe makes one cup of mayo, which is about 16 tablespoons.
Use room-temperature ingredients (especially the egg) for the smoothest, quickest emulsion.
No immersion blender? A food processor or high-speed blender works. Drizzle the oil in very slowly while running it.
For richer, more stable mayo, try one room-temperature egg yolk instead of the whole egg.
If raw egg is a concern, use store-bought pasteurized eggs for the same creamy result.
Too tangy? Add a tiny pinch of sugar (½ tsp max) after blending to balance without sweetening.
Store in an airtight jar in the main fridge compartment (not the door) for up to 1 week. Steady cold temps keep it from separating.