Freeze the tofu, then let thaw and squeeze out any remaining water (freezing helps give it a rubbery texture).
Make a thick marinade paste out of the lemon juice, nutritional yeast and onion powder. Paint each piece of tofu with the marinade then drizzle any remaining marinade over them as well. Let sit for 15 minutes in marinade.
Lightly grill for 2 minutes on each side. Eat and enjoy!
Source: Bella McCulloch