01 - Cut the pressed tofu into 8 thin, even slices for maximum marinade absorption.
02 - Whisk together soy sauce, olive oil, maple syrup, smoked paprika, liquid smoke, garlic powder, onion powder, and black pepper in a shallow dish until well combined.
03 - Add tofu slices to the marinade, turning to coat evenly. Let marinate for at least 15 minutes, turning once halfway through to ensure full flavor penetration.
04 - Heat a nonstick skillet or grill pan over medium heat. Add marinated tofu slices and cook for 3–4 minutes per side until golden brown and slightly crispy. Remove from heat.
05 - Toast bread slices until lightly golden. 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 while tofu is still warm and bread is crisp.