Thinly slice the cabbage into ribbons. You can use a mandoline if you prefer.
Add the lemon juice, garlic, olive oil, rice vinegar, mustard, capers, caper juice, cilantro, parsley, nutritional yeast, tahini, salt, and pepper to a blender. Pulse until smooth.
Pour the dressing over the cabbage and mix well to evenly coat. Serve as a side or in a taco.
