Cut the tomato into quarters, remove the seed and the stem. Cut the rest of the vegetables into some chunks, seeds removed as well. Put everything but the bread roll into the blender and let it do its magic.
1 kg Roma Tomato, 1 Cucumber, 1/2 Red Onion, 2 Garlic Cloves, 1 tsp Cumin, 3 tbsp Olive Oil, 1 tbsp Wine Vinegar, Pepper and Salt