Combine soy sauce, liquid smoke, garlic, and vinegar, then stir in the tofu pieces. Let marinate for about 15 minutes, stirring or shaking occasionally.*
Line plate with paper towels and set next to the stove.
Heat oil and test its readiness by dropping in a tiny piece of tofu. When it sizzles and quickly browns, add about ½ cup of tofu pieces and fry until brown, about 4-5 minutes. Turn each piece and brown the other side. Transfer to paper towels and repeat with remaining tofu.
Serve hot as a snack, mix into rice, roll up in a tortilla along with some beans… the sky’s the limit!