Sausage-Stuffed Mushrooms

20 large button mushrooms;

1 lb. sausages, casings removed;

1 onion, thinly chopped;

½ bell pepper, thinly chopped;

2 garlic cloves, minced;

2/3 cup almond meal;

2 tbsp. fresh parsley leaves, minced;

2 tbsp. olive oil;

Cooking fat;

Sea salt and freshly ground black pepper;