Shrimp with Bow Tie Pasta Salad

dry farfelle (bow tie) pasta

Splash of olive oil

chopped Vidalia, or other sweet onion

chopped green bell pepper

sliced celery

sliced black olives

seasoned boiled shrimp

kosher salt , or to taste

freshly cracked black pepper , or to taste

to 1/2 teaspoon of Cajun seasoning (like Slap Ya Mama ), or to taste, optional

garlic powder

medium tomato , seeded, cleaned and chopped (add just before serving)

chopped fresh parsley , reserve a pinch for garnish (add just before serving)

mayonnaise

olive oil

apple cider vinegar

spicy mustard

milk