Creamy Cucumber Pasta Salad

Bahan-bahan (8 porsi)

• 1 English cucumber
• ½ pound medium pasta (such as penne or rotini)
• ½ sweet onion
• ½ cup sour cream
• ½ cup mayonnaise
• 1 teaspoon granulated sugar
• ½ teaspoon salt
• 2 tablespoons chopped fresh dill
• 2 tablespoons white vinegar
• black pepper (to taste)