Gather the ingredients.

Place the sesame seeds on a small plate. Dredge the tofu slices in the sesame seeds to coat them on all sides.

In a large skillet, heat 2 tablespoons of the oil over medium-high heat. Add the tofu and cook until golden brown, about 3 minutes on each side. Transfer the tofu to a serving platter.

In a large skillet, heat 2 tablespoons of the oil over medium-high heat. Add the tofu and cook until golden brown, about 3 minutes on each side. Transfer the tofu to a serving platter.

Add the remaining tablespoon of oil to the skillet. Add the onion, bell peppers, and ginger and cook, stirring often, until the vegetables are softened, about 8 minutes.

Stir in the sesame oil and tamari.