In a bowl, combine the flour, lemon-pepper, butter and cream until smooth. Stir in the cheese; set aside. Cut a lengthwise slit down the center of the roast to within 1/2-in. of the bottom. Open roast so it lies flat; cover with plastic wrap. Flatten to 3/4-in. thickness. , Remove plastic; place ham slices over roast. Spread cheese mixture lengthwise down the center of one side of roast to within 1-1/2 in of ends. Roll up, jelly-roll style, starting with the long side with cheese filling. Tie several times with kitchen string; secure ends with toothpicks. , Combine paprika, marjoram, oregano and basil; rub over roast. Place on a rack in a shallow roasting pan. Bake, uncovered, at 350° for 40-45 minutes hours or until a thermometer reads 145°. Let stand for 5 minutes before slicing. , Meanwhile, in a skillet, saute onion in butter until tender. Stir in the cornstarch until blended. Whisk in cream and broth. Bring to a boil; cook and stir for 2 minutes or until thickened. Remove from the heat; stir in sour cream and salt. Slice roast; serve with cream sauce.