Looking for an everyday meal idea? Tuna, tomato, and mozzarella quiche is often a crowd-pleaser! For a balanced meal, quiche is a perfect blend of delicious flavors. Step 1 Preheat the oven to 200°C (392°F). Preparing the filling: Step 2 Slice the tomatoes into thin rounds and dice the mozzarella. Step 3 Cut the puff pastry and place it in individual molds. Prick the pastry with a fork. Step 4 Spread mustard on the tart shells and crumble the tuna on top. It is preferable to use grain-free mustard for a milder result. Step 5 Cover the tuna with tomato slices and mozzarella. Preparing the custard: Step 6 In a bowl, beat the eggs with the cream, then add salt and pepper. Step 7 Pour this mixture onto the tartlets and sprinkle with basil and parsley. Step 8 Bake for about 40 minutes.