# What You'll Need:
→ Base
01 - 1 large egg, at room temperature
02 - 1 tablespoon Dijon mustard
03 - 1 tablespoon white wine vinegar or lemon juice
→ Oil
04 - 1 cup neutral oil, such as sunflower, canola, or light olive oil
→ Seasoning
05 - 1/2 teaspoon fine sea salt
06 - 1/4 teaspoon freshly ground black pepper, optional
# How To Make It:
01 - Place the egg, Dijon mustard, vinegar or lemon juice, salt, and pepper if using, into a tall, narrow container suitable for an immersion blender.
02 - Pour the neutral oil over the top of the other ingredients.
03 - Insert the immersion blender all the way to the bottom of the container.
04 - Turn on the immersion blender, keeping it at the bottom for about 10 seconds, until the mixture starts to emulsify and becomes creamy.
05 - Slowly lift and lower the blender to mix in all the oil, blending until the mixture is thick and smooth, about 30 seconds.
06 - Taste and adjust the seasoning if necessary.
07 - Transfer the mayonnaise to a clean jar, seal with a lid, and refrigerate. Use within one week.