If the sub roll you're using is unsliced, slice it open length-wise so that the two halves stay attached at the edge.
Slice the cheese in half to make 2 triangles. Layer each 12-inch sub with 4 triangles (2 slices) of cheese. Top each sub with ½ of the garlic herb tofu. Top with red onion and bell pepper.
Place the subs on a baking sheet. Bake at 350F for 5-10 minutes, until cheese is melted and the subs are toasted.
Spread each sub side with mayo and mustard (optional). Top with tomato, cucumber, and lettuce.
Drizzle the lettuce with balsamic vinegar and freshly ground black pepper. Slice each 12-inch sub in half to make 4 sandwiches. Enjoy!
Notes
Leftovers: The subs are best enjoyed immediately after making but will keep refrigerated for up to a day. The lettuce tends to wilt and may need to be replaced or added just before eating.
The tofu can be made 2-3 days in advance. Keep refrigerated in a closed container until ready to use.
Nutrition facts are an estimation and will vary based on ingredients used.