Meanwhile, heat the oil on high in a 12 inch skillet. When the oil is hot, add the tofu. Stir fry until a crust forms, about 5 minutes. Add the vegetables, and stir fry for another 5 minutes. Add about 1 cup of the Serious Foodie Tamarillo Grill Sauce, and toss. Salt and pepper to taste. Add the scallions, and serve with an Asian hot sauce (for example, Serious Foodie Indonesian Sambal).