Oven: 180/190 deg.C
Layer the following ingredients, and season well, in a buttered shallow ovenproof dish: - (in any amounts you fancy).....
Sauteed in Olive oil and a knob of butter - some white onion, peeled and sliced
Thinly sliced white peeled potatoes (uncooked)
Sliced chestnut mushrooms
a little Fresh thyme if possible otherwise dried is fine
small amount of crushed or chopped garlic
salt and freshly ground black pepper
After approx. 40 mins. make sure all the veg. are cooked through,
Add the grated Gruyere over the top - 2-3 ozs.
and put back in the oven for about another 1/2 hr.until nicely melted.
You can cook this dish in advance before putting on the cheese -
sprinkle on the grated cheese and put back into the oven for about 1/2 hr. until hot and the cheese has nicely melted.
This is lovely served with rice and/or a good salad.