Steps
- Peel 500g of potatoes and grate coarsely. Peel and thinly slice 200g of onions; remove the rind from 300g of semi-aged Montasio cheese and grate.
- Melt 30g of unsalted butter in a large pan over low heat. Soften the onions for 15 minutes, stirring often. Add the potatoes and cook over medium-low heat for 10 minutes.
- Stir in the cheese; season with salt and pepper. Cook over medium heat for about 20 minutes, stirring until melted and thoroughly combined.
- Melt 20g of unsalted butter in a 10in / 25cm nonstick skillet. Transfer the mixture, draining excess fat, and flatten. Cover and cook over medium-high heat for about 15 minutes, until crusted underneath.
- Remove from heat briefly, invert onto a plate, and slide back into the skillet. Brown the second side for about 10 minutes. Rest briefly before cutting.