A dragging Tuesday night, potatoes waiting in the bag for a week, and nothing in the fridge that really inspires. This gratin exists exactly for those moments. Beef, béchamel, mozzarella — it already sounded good before even starting.

The gratin comes out of the oven with that orange-brown crust that blisters slightly at the edges, where the béchamel has caramelized. Underneath, the beef meatballs have absorbed all the sauce, and the potatoes are meltingly tender without falling apart. The smell is a mix of warm nutmeg and browning cheese — the kind of scent that brings people into the kitchen without needing to call them. Comforting without being heavy.