Kumpir (Baked Potato Mashed in Its Own Skin)

Variations

• Instead of kasar: outside Turkey a young gouda or mozzarella is the closest thing — any cheese that melts smoothly and is not aggressively salty. Cheddar splits as it melts and leaves the flesh greasy.
• The toppings are not fixed: a cart in Ortakoy in Istanbul lays out twenty of them and lets you point. The one photographed here is corn, pickled red cabbage and olives under shredded chicken.
• Vegetarian: the list above already is. Sausage or chicken is what the shops add, not what the dish requires.
• Smaller potatoes: under 300g the skin is too thin and folds when you open it. If you must, serve two to a plate and cut the bake to 40 minutes.
• How it differs from mashed potatoes: that dish boils the potato and mashes it in a bowl; this one bakes it and mashes it inside the skin. Different tool, different target.

Tips

• The vessel is the skin, which is why the potato is never boiled. Boiling drives water into a potato and baking drives it out. Mashed potatoes makes "steam off the moisture" its first instruction, which is the work of sending that water back; here it never arrived. What the departing water leaves behind is a skin dry and stiff enough to carry a pile of toppings.
• So the potato is dried before it goes in. A wet skin steams itself in its own moisture and a steamed skin folds the moment you open it. The fork holes are the same idea from the inside: with nowhere to go, the steam raised in the flesh softens the skin from behind.
• Do not cut through the base. Split all the way and you have two pieces of skin. The hinge is what makes them one bowl that stays open under weight.
• The mashing happens against the shell. As mashed potatoes sets out, worked hard a potato bursts its cells and the amylose that leaks out is the glue. Here you have a fork and a curved wall to press against, so working it hard is not available — the physical limit does the job that choosing a ricer does there.
• Butter first, cheese second. The butter has to melt into the flesh; the cheese has to melt and hold it together. Reversed, the cheese sets in lumps and blocks the butter.
• The toppings go on cold. The dish is eaten as a contrast — hot inside, cold pickles. As serving temperature puts it, cold mutes seasoning, which is why the things that end up in the topping tray are the ones already carrying sharp acid and salt.
• Olivier salad as a topping is not the oddity it looks. In Turkey it is both a finished salad and a standard kumpir topping, so cold mayonnaise-bound potato goes on top of hot potato. One ingredient arrives twice on one plate, at two temperatures and in two textures.
• Ten minutes is the whole window. The skin keeps taking steam from below and the cold toppings keep warming up. Carried home in a box, this dish becomes potato salad.