Wash the heads and shells of fresh shrimp with plenty of water and lemon;
Put them in a pan along with the onions, tomatoes, peppers, garlic and olive oil, all seasoned, salt, chives and fresh coriander, spices and condiments to your taste and sauté well;
Boil everything with a little water mixed with cornstarch over low heat;
Grind everything in the blender and, soon after, pass it through a sieve, leaving only the shrimp broth that can be used in different ways, according to your need, taste and occasion.