You can also enjoy the grilled green tomatoes at room temperature; no need to reheat them; that will probably make them mushy. If you have leftover grilled green tomatoes, you can stuff them in sandwiches, flatbreads, or tortillas, adding some yogurt sauce or other sauces like remoulade or plain mayonnaise. Add other ingredients to your liking: ham, different sorts of cheese, salad leaves, hummus, cooked tofu, egg salad.