Making Lemon-Dijon Asparagus and Pea Macaroni Salad is simple if you follow these steps:

1. Cook the Pasta: In a large pot, bring salted water to a boil. Add the elbow macaroni and cook according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
2. Blanch the Asparagus: In a separate pot, bring water to a boil. Add the asparagus pieces and blanch for 2-3 minutes until bright green and tender-crisp. Drain and immediately transfer to an ice bath to stop the cooking. Drain again after a few minutes.
3. Combine Ingredients: In a large mixing bowl, combine the cooked macaroni, blanched asparagus, sweet peas, cherry tomatoes, and red onion.
4. Make the Dressing: In a small bowl, whisk together the mayonnaise, Dijon mustard, lemon juice, lemon zest, salt, and pepper until smooth and well combined.
5. Mix Salad and Dressing: Pour the dressing over the macaroni and vegetable mixture. Gently toss until everything is evenly coated.
6. Chill: Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
7. Garnish and Serve: Before serving, give the salad a final toss and garnish with fresh parsley if desired.

These clear steps will guide you in preparing this delightful salad with ease.