Let the light cream, half-and-half, or whipping cream and margarine or butter come to room temperature (allow about 30 minutes). Meanwhile, cook pasta, adding peas the last 5 minutes of cooking. Drain immediately in a colander. Return pasta and pas to the warm saucepan. Add the room-temperature cream and margarine, the Parmesan cheese, and lemon peel to the pasta. Toss gently till pasta and peas are well coated. Transfer to warm individual plates. Sprinkle with pecans or walnuts. Serve immediately.
