This open faced British classic skips the top crust entirely and lets a layer of golden, bubbling cheddar sit right on show. It began as a clever way to stretch humble pantry staples like potatoes, onions and leeks into something warm and filling. The pastry case gets blind baked first, so it stays crisp under a soft, savory filling of buttery mash, sweet leeks and plenty of sharp cheese. It is rustic, unfussy and endlessly comforting.
2lbspotatoesabout 900g, peeled and cut into small chunks
3medium leekstrimmed, cleaned and thinly sliced
1medium yellow onionfinely chopped
2clovesgarlicminced
2cupsmature cheddar cheesegrated and divided
3tablespoonsfresh parsleyfinely chopped
1/4cupwhole milkor heavy cream
saltto taste
black pepperto taste
nutmega pinch, freshly grated (optional)
Instructions
Make the pastry: Pulse flour and salt in a food processor. Add ¾ of the cold butter and pulse to breadcrumbs. Add egg and ice water, pulsing until dough clumps. Chill for 30 minutes.
Blind bake: Preheat oven to 375°F (190°C). Roll dough into a 12-inch circle, press into pie dish, trim and prick. Line with parchment and weights. Bake 15 min, remove weights, bake 5-8 min until pale gold.
Cook potatoes: Boil potato chunks in salted water for 12-15 minutes until tender. Drain and steam dry.
Soften leeks and onion: Melt remaining butter in a skillet. Cook leeks and onion for 8-10 minutes until soft. Stir in garlic for the last minute.
Combine filling: Mix potatoes with leek mixture, half the cheddar, parsley, and milk. Season with salt, pepper, and nutmeg. Break potatoes slightly with a fork.
Fill and bake: Spoon filling into pastry case, mound slightly. Top with remaining cheddar. Bake 20-25 minutes until cheese is golden and bubbling. Rest 10 minutes before slicing.
Notes
Keep your butter and water very cold when making the pastry, since this is what gives it that flaky texture.
Do not skip the blind baking step, or the base will turn soggy under the moist filling.
Cut the potatoes into similarly sized chunks so they cook evenly.
Cook the leeks low and slow rather than rushing them over high heat, so they turn sweet instead of tough.
Use a block of cheese and grate it yourself for the best melt and flavor.
Let the pie rest before cutting so the slices hold their shape.
Refrigerate leftovers in an airtight container for up to 4 days.
Freeze baked and cooled slices, wrapped tightly, for up to 2 months.
Reheat in a 350°F (175°C) oven for 15 to 20 minutes, until warmed through.
Avoid microwaving if possible, since it can make the pastry soft rather than crisp.