Step 1: Combine Ingredients: In a medium bowl, whisk together the grated fresh ginger, rice vinegar, soy sauce, sesame oil, vegetable oil, honey (or maple syrup), sugar, minced garlic (if using), and finely chopped onion (if using).
Step 2: Emulsify the Dressing: Whisk vigorously until all ingredients are well combined and the dressing appears slightly emulsified. Alternatively, place all ingredients in a blender or food processor and blend until smooth. This creates a more stable emulsion and a creamier texture.
Step 3: Taste and Adjust: Taste the dressing and adjust the seasonings to your preference. Add more honey for sweetness, rice vinegar for tanginess, or soy sauce for saltiness.
Step 4: Store and Serve: Transfer the dressing to an airtight container and store in the refrigerator for up to 1 week. Shake or whisk well before each use as the dressing may separate slightly upon standing. Serve over your favorite salads, grilled vegetables, or as a marinade.
For a spicier dressing, add a pinch of red pepper flakes or a small piece of finely chopped chili. If you don't have rice vinegar, apple cider vinegar can be used as a substitute, but it will alter the flavor slightly.