Cut thin tuna steaks (or have fishmonger do it). Do not buy thick cuts and pound to 1/2-inch thickness like you would veal. Tuna is too delicate.
In a saucepan, poach the raisins in the port until plump. Drain and reserve the raisins.
Mix the bread crumbs, grated Parmesan, olive oil and, if desired, some chopped parsley together with salt and pepper. Dredge tuna in bread crumb mixture.
Mix the olive oil and the clarified butter. Salt and pepper the tuna paillards and dredge in the oil-butter mixture. Dip again into the bread crumbs, thoroughly coating both sides.
In a saute pan over medium to high heat, add a little oil and when hot the whole butter. Add the breaded paillards and saute on one side about 3 minutes until brown and crisp. Turn and cook the other side until brown and crisp. (Make sure not to crowd the saute pan. You will probably only be able to cook 2 paillards at a time.) Keep warm.
When paillards are cooked, wipe out the pan, add a little oil (or left over butter-oil mixture) to the pan. Add in the garlic and cook 2 minutes. Add the mushroom quarters and saute until browned. Add in the spinach, pine nuts, prosciutto, and let start to wilt. Remove from the heat.
In the stainless bowl, add the raisins, onions, shredded Parmesan, and wilted spinach mixture, dress with the vinegar and toss.
On six warm dinner plates, divide the spinach mixture and sprinkle on the lemon juice. Top each with a tuna paillard and top each paillard with the Caper Parsley Relish. Serve warm with a lemon crown.
Parsley Caper Relish:
Mix all together in a large bowl.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.