Cannelloni filled with prawns

This recipe for cannelloni stuffed with prawns and shrimp is a good opportunity for children comanverdurasypescadoque perhaps one of the most widespread problems among mothers.
They are so rich that surely make this recipe again and children will enjoy the pasta, and the not so young.

ingredients:
     1/2 kg. Shrimp.
     1 chopped onion.
     1 clove garlic, minced.
     1/2 finely chopped carrot.
     1 stalk celery, chopped Celery or.
     1/2 stalk chopped leek or leek.
     1/2 liter of cream.
     2 tablespoons butter.
     2 tablespoons wheat flour.
     1/2 red pepper or red pepper finely chopped.
     1 pack 250g cannelloni.
     1 tablespoon minced parsley.
     150 grams. grated Parmesan cheese.
     1/2 cup devinoblanco
     Salt and pepper.

Preparation:
Separate and peel the shrimp heads. Put to cook in a pot: half a chopped onion. The carrot, garlic and celery along with the rest of the shrimp (heads and shells), for half an hour. Then strain the broth and reduce to a simmer and reserve
Prepare a sauce with half an onion, red pepper and leek until soft, then add the chopped shrimp, wine, salt and pepper. I jumped about 5 minutes and set aside.
In a saucepan, bring to network to heat the butter and saute the flour where it becomes like a paste, mixed with shrimp broth and cream, do not lump or burn, whisking constantly, until it is as a cream bechamel.
Fill the cannelloni and boiled with the sauce, and place in a pan with butter and flour. First a layer of cream, cannelloni, cream and cheese.
Set oven to broil high.