1 pound tomatoes
1/2 pound Swiss chard, stemmed, leaves washed in 2 changes of water
Salt to taste
1 tablespoon grapeseed oil
1 small or 1/2 medium red onion, chopped (about 1 cup)
2 large garlic cloves, minced
1 teaspoon lightly toasted cumin seeds, ground
1 teaspoon mild chili powder
1 to 2 serrano or jalapeño chiles (to taste), seeded if desired and minced
1 14-ounce box firm tofu, drained and cut into medium-size cubes
1/4 cup chopped cilantro (more to taste)
8 warm corn tortillas
Salsa fresca (optional)