Prepare the food. Peel onions and garlic and chop finely. Red pepper to release the seeds and finely chop. Mussels thawed, place on a paper towel then in a bowl and pour the lemon juice for 15 minutes.
Meanwhile fry the onion in a pan in oil for 3 minutes until Golden brown.
Add the garlic and pepper. Cook a couple of minutes.
Take a small form. Lay out onion with garlic and pepper. Put the mussels, salt to taste, pour the cream. Cheese grate and sprinkle on top of the form with mussels.
Send in a preheated oven for 10 minutes at t-180, 200 C. Focus on your oven. Our gratin is ready)