Find recipes for Schreiner's Baked Lamb Shanks and other Course recipes. Get all the best recipes at . Recipe directions: Place the lamb shanks in an ungreased 13-in. x 9-in. baking pan. Sprinkle with salt and pepper. Bake, uncovered, at 400° for 30 minutes. Remove from the oven and reduce heat to 350°. Add broth to the pan. Combine onion, rosemary, garlic powder and mustard; sprinkle over lamb. Cover tightly and bake for 2-1/2 to 3 hours or until very tender. If desired, make gravy from pan drippings. Serve lamb with gravy and mint jelly if desired.