1. Cook pasta according to package directions; drain. Return pasta to saucepan.
2. Meanwhile, in a large skillet cook asparagus, squash, and garlic in hot margarine for 2 to 3 minutes or until vegetables are crisp-tender, stirring frequently. Remove with a slotted spoon and add to pasta.
3. Combine whipping cream and lemon peel in skillet. Bring to boiling. Boil for 2 to 3 minutes or until mixture is reduced to 1/3 cup. To serve, pour cream mixture over pasta mixture; toss gently to coat.