Place cashews in a small saucepan with water to cover.
Heat to boiling over high heat.
Remove from the heat, drain, and rinse in a fine-mesh strainer.
Transfer to a blender. Add aquafaba, lemon juice, oil, sugar, salt, and mustard, if using.
Process until smooth, about 1½ to 3 minutes, depending on the blender.
Taste and adjust seasoning.
Transfer to a small jar or small bowl.
Cover, label with a use-by date, and refrigerate for up to 10 days. Or freeze for up to 3 months.
Notes
Tips:
Boiling the nuts softens them, making them easier to blend. It also extends the shelf life by killing bacteria, and improves the color.
Label the container with a use-by date to make sure you use it up before it spoils.
Soak large cashew pieces for 3-5 minutes.
Aquafaba is the liquid from cooked chickpeas or white beans.
The mayonnaise will thicken as it cools. It will be thicker with the aquafaba.
Variations:
Cashew Aioli: To one cup Vegan Mayonnaise, stir in 2-3 minced garlic cloves. If desired, thin with water. Serve as a dip with fresh vegetables, steamed broccoli, or sweet potato fries.
Cilantro-Lime Sauce: Process one cup Vegan Mayonnaise, made with lime juice, ½ bunch fresh cilantro (including stems), 2 minced or peeled garlic cloves, and ½ teaspoon lime zest in a blender until smooth. If desired, thin with water. Serve with black bean burgers, tacos, veggie power bowls, or veggie fajitas.
Creamy Cumin-Lime Sauce: To one cup Vegan Mayonnaise made with lime juice, stir in ½ teaspoon cumin. Thin with water to desired consistency. Serve with black bean burgers, tacos, veggie power bowls, or veggie fajitas.
Chipotle Sauce: Process one cup Vegan Mayonnaise, 1 teaspoon chipotle in adobo sauce (or to taste), and 2 minced garlic cloves in a blender until smooth. Thin with water to desired consistency. Serve with black bean burgers, tacos, veggie power bowls, or veggie fajitas.
Ranch Dressing: To one cup Vegan Mayonnaise, stir in 1 tablespoon minced parsley (or 1 teaspoon dried parsley), 1 minced small garlic clove or 1/8 teaspoon garlic powder, and ½ teaspoon onion powder. Thin with 2 tablespoons water, or to desired consistency. Serve with salad or baked potatoes.
Vegan Sour Cream: Use as a sour cream substitute on baked potatoes, in Layered Bean Dip, or other dips.
Tartar Sauce: add chopped pickles.
Oil-Free Vegan Mayonnaise: Substitute 1 (12.3-ounce) package of aseptic pack silken tofu for the water and the oil. Reduce lemon juice to 3 tablespoons.
Oil-Free Vegan Mayonnaise: Emit oil.
Nut-free Vegan Mayonnaise: Substitute sunflower seeds for cashews.