Once the tofu is thawed, cut it into 1/2 inch thick slices; squares or triangles will work. Combine the marinade ingredients in a small bowl. Lay the tofu in a shallow baking dish and pour the marinade overtop. Refrigerate for 30 minutes or up to 24 hours.
Preheat your grill to medium-high heat. Grill the tofu about 5 minutes per side, until firm. It should have nice grill marks on both sides.
Vegetables
Bring a pot of salted water to a boil and add the green beans. Blanche for 2 minutes; drain and rinse with ice-cold water.
Combine the corn starch with a teaspoon of cold water. Heat a large skillet or wok over medium-high heat. Add the sesame oil, followed by the green beans, red peppers, and onions. Add the soy sauce (optional Tamari) and Szechuan sauce and stir quickly for about 1 minute. Add the corn starch mixture and stir until thickened.