Drizzle a few spoonfuls of sauce over each fillet and serve. Make chicken piccata using the same method: Use two boneless skinless chicken breasts or 4 cutlets (about 1½ pounds or 680 grams).
Pour in the chicken stock, add the rosemary, tomatoes, capers, juice from 1 lemon, and the lemon slices; lower heat to a simmer. Cook until the sauce is reduced; about 20 minutes. Serve.