This is an easy wonderful side dish. I happen to love brussels sprouts and this is a great way to prepare them. If you like spinach strata ... this is just like it and just as good or better in my opinion. The onion and leeks give it a great savory flavor and then the pumpernickel with the creamy cheese is a great compliment. It is great comfort food and it reminds me of Fall. Serve this with a slow cooked pork roast and some roasted sweet potatoes for a great dinner.