At least among the omnivores in my family, my seitan "carne" asada is a massive hit.

It's wheat gluten powder hydrated with brown veggie & mushroom broth, with cumin, chili powder, and a dash of soy sauce. Baked. Then diced and browned in corn oil with minced onion, a little more soy sauce, and a hint of molasses. Serve with freshly made corn tortillas and pico de gallo or tomatillo-aguacate salsa.