Wash the potatoes and cut in to slices, but dont skin, sprinkle with oil and stick them in an oven tray at 200C for 20min
While the potatoes are in the oven, cut the mushrooms, onion and apples roughly.
Throw them in the same oven tray that you've put the potatoes in after 20mins.
Grate the cheese and cover the tray with it.
Add ham slices
Put the tray back into the oven for another 15 mins
Once cooked, dice the gherkins and add them along with the rocket salad.
Sprinkle with salt and pepper if desired.
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