Prepare grits as label directs for 4 servings. When grits are cooked, stir in creamed corn; heat through. Dice onion. Slice lemon in half; squeeze juice from 1/2; set aside. Slice remaining half and use for garnish. In nonstick 10" skillet over med. heat, in hot oil, cook onion until tender. Increase heat to high; add shrimp, lemon-pepper seasoning, and salt; cook, stirring constantly, until shrimp turn opaque throughout and are lightly browned. Stir in minced parsley and lemon juice. Serve shrimp with grits. Garnish with lemon slices. Nutritional info. per serving: 350 cal.; 6g fat, 172 mg chol., 835 mg sodium.