Sauté in a medium saucepan the tomatoes, peppers and garlic. When the tomatoes and peppers are tender and slightly brown, place the tomatoes in a blender. Now, remove seeds and stems from peppers and add to the tomatoes.
Pour the water, orange juice and grapefruit juice in the blender with the peppers and tomatoes and puree until smooth. Sprinkle with salt and pepper and serve with your favorite meat.