Shrimp and Pasta Salad

2 tablespoons olive oil

500 grams shrimp, peeled and deveined

2 cups mayonnaise

1 red onion, minced

2 tablespoons fresh dill, chopped

lemon juice, from 1 lemon

1/4 cup sugar

1/2 teaspoon salt

1/4 teaspoon white pepper

500 grams spiral pasta, cooked according to package directions

1 cup black olives

2 cups seedless grapes

1/2 cup feta cheese, for garnish