- 1/2 cup vegetable oil
- 1/4 cup chopped onion
- 1/4 cup rice vinegar
- 1 tablespoon toasted sesame seeds
- 1 tablespoon minced fresh ginger root
- 1 tablespoon umeboshi, minced
- 1 1/2 teaspoons lemon juice (optional)
- 1 teaspoon white sugar, or more to taste
- 1 teaspoon salt
- ground black pepper to taste
- Place the vegetable oil, onion, rice vinegar, sesame seeds, ginger, umeboshi, lemon juice, sugar, salt, and pepper into a blender. Cover, and puree until smooth, about 30 seconds.