Here is a full-flavored and nourishing sauce that is excellent when served over burgers, cooked vegetables, or rice.
In a small skillet, sauté onion in vegetable oil until lightly browned.
Add tahini. Cook and stir for a few minutes until tahini gives off a roasted aroma.
Remove from heat. Stir in miso to taste. Add ¾ cup water and mix well. Add additional water, as needed, to make a smooth sauce.