Roquefort Cheese Tart - Cook with Sousou

Ingredients

• 250 g flour
• 125 g melted butter
• 1 pinch salt
• 1/3 cup water
• 300 g grated roquefort cheese
• 100 g mozzarella, grated
• 1 pack feta cheese, mashed
• 50 g fresh oregano, chopped
• 1 big onion, diced
• 1 tablespoon corn oil
• 2 eggs
• 300 ml fresh cream
• ½ teaspoon black pepper
• salt to taste
• 100 g gruyere cheese, grated