In a shallow bowl, combine flour, salt and pepper. Cut each tenderloin into six pieces; flatten to about 1-inch thickness. Melt butter in large skillet. Dip pork into flour mixture; add to skillet and brown on both sides. Place in an ungreased 11x7 baking dish. In the same skillet, saute onion and garlic until tender. Add remaining ingredients; bring to a boil. Pour over pork. Cover and bake at 350 degrees for 1 hour or until the juices run clear and a meat thermometer reads 160 degrees.