Frozen Brussels sprouts get an upgrade in flavor when roasted with apple and sweet onion chunks and drizzled with lemon. You don't even have to thaw the sprouts -- just pour them frozen from the bag onto the baking sheet, season, and roast.
For this classic Italian appetizer, I chose Gorgonzola for its sweet creaminess, but any quality blue cheese will do. A slice of tart apple is a nice foil to the garlic and cheese.