Stuffed Flounder Roll Ups

Name: Stuffed Flounder Roll Ups
Ingredients: 4 small flounder fillets, each about 3-4 oz.; 2-3 large white mushrooms; 4-6 ounces reduced fat sour cream (or full fat, but not fat free); 2-3 scallions, green parts only, roughly chopped; 1/4 cup dry bread crumbs; 1/2 teaspoon dry thyme; salt & pepper; 1 lemon, sliced; 1 tablespoon butter; 2/3 cup dry white wine or vermouth; Pinch sumac or paprika to garnish