In olive oil (sometimes butter is used), fry the garlic, onions and carrots, cut into small pieces, until golden brown.
Add the shrimp heads without eyes and shells. Fry for 5-10 minutes.
We increase the heat and add wine, evaporate the alcohol.
Fill with very cold water (thermal shock gives a richer taste) and cook the bisque over low heat for 30-40 minutes. Add parsley for 5 minutes. I did not add it, so as not to spoil the bright color.
All that is in the pan, grind with a blender and filter through a fine sieve.
The result is a broth with a very rich shrimp flavor.