Quick Walnut Tacos

Place walnuts in a food processor and pulse until finely chopped, but not ground. Add cumin, garlic powder, onion powder, paprika and salt. Pulse just until blended. Transfer to a large skillet; toast over medium heat until heated through and fragrant, about 5 minutes. Add vinegar to taste and tamari and mix well.

Serve the walnut mixture, beans, lettuce, tomato, onion and salsa (or pico de gallo) in tortillas. Top with sour cream, if desired.