01 - Cut the tofu into 8 thin slices, approximately 1/4 inch thick for even cooking and optimal texture.
02 - In a shallow dish, whisk together soy sauce, olive oil, maple syrup, smoked paprika, liquid smoke, garlic powder, onion powder, and black pepper until fully incorporated.
03 - Add tofu slices to the marinade, turning to coat evenly. Let marinate for at least 15 minutes, turning once halfway through to ensure flavor penetration.
04 - Heat a nonstick skillet or grill pan over medium heat. Add tofu slices and cook for 3-4 minutes per side until golden brown and slightly crispy. Remove from heat and set aside.
05 - Toast bread slices until lightly golden and crisp. Spread vegan mayonnaise on one side of each slice while still warm.
06 - Layer ingredients on each sandwich in this order: lettuce leaves, tomato slices, smoky tofu, and red onion if using. Top with remaining bread slices.
07 - Slice sandwiches in half diagonally and serve immediately for optimal texture and flavor.