Cook rice following package directions, salt optional. Reserve.
Clean and slice asparagus into 1 1/2 inch pieces. Heat 1 tablespoon of the margarine in large nonstick skillet. Add asparagus; stir-fry 3 minutes. Remove from skillet. Reserve.
Add remaining 1 tablespoon margarine to skillet. Add shrimp; stir-fry over high heat 2 minutes. Stir in garlic; stir-fry 1 minute more. Stir in lemon juice, salt and pepper.
Stir asparagus and rice into skillet. Heat to serving temperature.
Garnish with lemon wedges, if you wish.