Slice tofu into 6 even slices. Heat a pan with 1 Tbsp of sesame oil over medium-high heat. Add tofu slices to the pan once hot. Cook on each side for 4-5 minutes, or until golden brown. Add tofu to a separate plate.
Reduce heat to medium-low and pour teriyaki sauce into the pan. Add the tofu back in to the pan and cover them in the sauce.
Build the sandwich with herbed tofu dip, teriyaki tofu, red onions, red pepper, and lettuce.