Making Tuna Pasta Salad is easy if you follow these steps:

1. Cook the Pasta: In a large pot, bring salted water to a boil. Add the pasta and cook according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
2. Prepare the Vegetables: While the pasta cooks, chop the cherry tomatoes, cucumber, bell pepper, red onion, and thaw the peas. Set aside.
3. Mix the Dressing: In a large bowl, combine the mayonnaise, Dijon mustard, lemon juice, salt, and pepper. Whisk until smooth.
4. Combine Ingredients: Add the drained tuna, cooked pasta, and chopped vegetables to the bowl with the dressing. Toss gently until everything is well coated.
5. Adjust Seasoning: Taste and adjust the seasoning if needed, adding more salt, pepper, or lemon juice according to preference.
6. Chill (optional): For best flavor, let the salad chill in the refrigerator for 30 minutes before serving.
7. Garnish: Just before serving, garnish with fresh parsley if desired.

Following these simple steps will help you create a Tuna Pasta Salad that is not only delicious but also visually appealing!