The smell that fills the kitchen when the ground beef starts browning with the onion—that’s the signal. Everyone shows up without being asked. This gratin is exactly that: no fancy speeches needed.

The surface is golden like a light caramel, slightly cracked in places. Underneath, the layers of potatoes have soaked up the broth and the meat juices throughout the cooking process—they are meltingly soft, almost creamy. The cheese has formed that irregular crust that you scrape with your fork even before serving. It smells like home, winter, and comfort.