The gratin taste marvellous and it is even a dish zucchini skeptics can enjoy. It is very simple to prepare and one that you can prep in advance and cook later. The dish is filling enough to serve as a main but would also work as a side for a roast.
I am sure you would be alright to substitute swiss cheese for Gruyere.
Zucchini Gratin
6 tbsp butter
3 large onions, sliced
4 small zucchinis, sliced
1 tsp salt
1 tsp ground pepper
1/4 tsp nutmeg
2 tbsp flour
1 cup milk
3/4 cup bread crumbs
3/4 cup Gruyere cheese, grated
- Melt the butter in a large sauté pan (large enough for the zucchini and onions to all go in, a wok will work if you don't have a big enough one) and cook the onions until they are soft and translucent. You do not want them to brown.
- Add the zucchini and cook it covered for 10 minutes.
- Add the salt, pepper and nutmeg. Uncover and cook for another 5 minutes.
- Whisk the flour into the hot milk and pour over the mixture. Cook over low heat until the remaining liquid is more like a sauce.
- Pour the mixture into a 8 x 10 inch baking dish.
- Combine the bread crumbs and Gruyere and sprinkle it on top of the zucchini mixture.
- Cut the 1 tbsp of butter into small pieces and dot it on top of the crumble top.
- Bake at 400 for 20 minutes or until the it is bubbly and browned.