Charm with Swiss chard

It is necessary:
 
10 large Swiss chard leaves,
300 g minced beef,
1.5 cups of rice,
salt,
Pepper,
two tablespoons of oil,
three tablespoons of hot water.

Preparation:
 
Boil chard, strain and rinse with cold water.
Other ingredients well incorporate by fork.
Each leaf Swiss chard divided into two parts.
In each part put one tablespoon of mixture and roll up obtained (the charm).
In a saucepan, in a little oil stew onion, salt and pepper to taste.
Pour one liter of water.
When the water boils remove from heat and put into order charms.
Back to the fire and, when boils, reduce heat and allow to simmer for one hour.
Pour sour cream and place in preheated oven 15 minutes, to brown.