Egg, Bacon & Cheese Gratin - How to Make Eggs Au Gratin with Tomato Sauce Learn how to make hard-boiled egg gratin with tomato sauce, smoked bacon and cheese. This delicious recipe is easy to make and everyone will love it! ▼ INGREDIENTS LIST: - 5 large eggs - 5 slices of smoked bacon - 10 tablespoons of tomato sauce - 3 slic