Press tofu, cut into cubes, and cook brown rice according to package directions.
Heat sesame oil in a large skillet over high heat, add tofu cubes and cook until golden on two sides, then remove to a plate.
Add minced ginger and garlic to the same skillet, stir for 30 seconds, then add sliced peppers and snap peas and cook for 4 minutes until tender-crisp.
Return tofu to the skillet, add tamari sauce and 2 tablespoons water, then toss gently until everything is coated and heated through.
Serve stir-fry over warm brown rice.