I got this recipe from the magazine, Bon Appetit a couple of years ago. The first time I made it, we were hooked! Mascarpone is an Italian cream cheese that can be found in many grocery stores and Italian markets. This recipe calls for salmon fillets but I found it easier to use the whole fillet and then cut it after cooking. Increase the cooking time to 25-30 minutes if using the whole fillet. And use fresh grated cheese...not that stuff in a canister that you find on the grocery shelf.