Tofu or Tempeh Bars

1 pound firm tofu, rinsed, or tempeh 1 medium onion 2 tablespoons oil 2 tablespoons soy sauce 2 tablespoon rice vinegar 4 tablespoons tomato paste 1 1/2 to 2 cups water or broth (more for tempeh) 1/4 teaspoon mustard pepper … Continue reading