Duck, Foie Gras and Mushroom Pie

Duck, Foie Gras and Mushroom Pie
Ingredients :
2 puff pastries
300 g of duck breast
150 g of foie gras
100 g button mushrooms
1 onion
1 clove of garlic
1 egg yolk for gilding
Salt and pepper
Preparation :
Preheat the oven to 180°C.