Cut the zucchinis in half and scoop out the insides. Boil them in boiling water for 5 minutes. Place the boiled zucchinis in a baking dish. Meanwhile, sauté the peppers with oil in a pan. Then add the minced meat. Add the tomatoes and continue cooking and add salt. Fill the zucchinis with the prepared minced meat mixture. Bake in a 200 degree oven until golden brown.