in small sauce pan boil chiles until soft, add to blender with garlic, bay leaves, and tomillo and blend to smooth... set aside.
in large pot add water and dry shrimp, cook about 15 minutes then remove shrimp, u dont want to eat them they r for flavor only.
add to the pot the carrots and the onion, cook until they are tender
add the raw shrimp, cilantro and salsa from blender and cook for another 8-10 minutes
salt to taste
serve with bolillos and a squeeze of lime juice