Preheat the oven to 190°C/ 170°C fan/ gas mark 5/ 375°F
Grate the cheese (a coarse grater is fine)
Scrub the potatoes (or peel them if you really want to). Thinly slice the potatoes. Each slice should be approximately 3mm thickIf the slices are thicker they will not cook in the time
Lightly grease the dish with butter to stop the potatoes sticking
For the Mince and Potato Gratin:
Put a single layer of potatoes onto the bottom of the dishThis will be about half the potatoes, or just under
Spoon/pour all the Basic Bolognese onto the potatoes and level out with the back of a spoon
Layer the remaining potatoes on the top
Sprinkle with salt and pepper. Cover the top with the cheese - make sure all the potato is covered
Cook for 1 hour 30 minutes. The cheese will be golden and the sauce will be bubbling up at the side.
Notes
Everyday Cooks tips
If you are putting this in the oven ahead of time on the timer, add an extra 10 minutes to the cooking time. The gratin won't spoil if it has to stay longer in the oven, once it's turned off
If you are cooking this straight from the fridge, put in a cold oven and add 10-15 minutes to the cooking time