Crustless tuna quiche. In a container put in order: ½ liter of milk, 3 eggs, 100 g of flour, 100 g of grated Gruyere cheese, salt, nutmeg, 1 can of tuna or (smoked salmon). Preparing the Tuna Crustless Quiche: Mix everything well. Pour into a tart pan. Cook for 30 to 40 minutes.