1 tablespoon olive oil
1 small onion, (diced)
2 garlic cloves, (minced)
2 teaspoons ground cumin
1 teaspoon ancho chile powder
1 teaspoon paprika
Pinch cayenne pepper, (optional)
1/2 cup finely chopped shelled walnuts
1 (14 ounce or 400 gram) can black beans, (drained and rinsed)
1/2 cup canned tomato sauce
1 tablespoon lime juice
2 tablespoons chopped fresh cilantro ((packed))
Salt & black pepper, (to taste)
6 taco shells or corn tortillas (see Note)
Toppings of choice, such as shredded cabbage, salsa, guacamole, vegan sour cream or vegan cheese