Step 3
Meanwhile, melt the butter in a large skillet over medium heat. Add the sirloin strips, and cook until no longer pink, about 6 minutes. Remove the sirloin to a casserole dish, then stir the mushrooms into the hot skillet. Cook and stir for 2 minutes, then season with the mustard, ginger, salt, and pepper, and cook 3 minutes more. Pour in the red wine and Marsala wine, and bring to a simmer over medium-high heat. Add the cream and half of the crumbled feta cheese, reduce heat to medium-low, and simmer 5 minutes, stirring occasionally. The feta helps thicken the cream. The cream sauce is not a gravy, so it will not thicken like gravy. Once ready, pour the mushroom mixture over the sirloin strips, and sprinkle with the remaining feta cheese.