Put the walnuts in a food processor with the blade in place, and process until chunky. Scrape the ground nuts into a bowl, and mix in the cumin, coriander, chili powder, and cayenne. Add the tamari and mix again. You now have your taco 'meat'!
On a plate of salad greens, sprinkle 2 tbsp of the taco 'meat' and add a handful of halved cherry tomatoes, 1/4-1/2 of an avocado, a few tablespoons of salsa, a squeeze of lime, some freshly ground pepper, and a sprinkle of nutritional yeast for a cheesy addition if you prefer.
If you are on the go, you can also make Burritos and wrap the ingredients above in a collard leaf. Also very delicious!