After baking, let the gratin cool to room temperature, then top with parchment, a tray and some weights on top. Refrigerate overnight. This firms up the layers, making slicing cleaner.
How To De-Mold Potato Gratin
Run a small offset spatula around the edges to loosen. Place a flat tray or cutting board over the baking dish, then flip firmly and confidently.
Tap the dish if needed—the gratin should release in one solid block. Remove the parchment paper.
Cut into Portions
Trim the edges first, and save scraps for your next omelet!
Cut into desired portions. Here, I divided my gratin Savoyard into four 6X3.75-inch/15X9.5cm slabs. Each serves 4.
How To Get Crispy Potato Gratin
Preheat fan oven to 450ºF/230ºC. Transfer gratin onto a baking tray, and top with parmesan.
Put the prepared gratin in the hot oven for 15 minutes until crispy and golden brown. Do it in your wood-fired oven or pizza oven if you've got one! (bottom temp: 620ºF/325ºC.
Potato gratin can be cut into serving portions before or after been reheated. Enjoy!