Greek Tortellini Salad

Name: Greek Tortellini Salad
Prep time: 15 min
Total time: 15 min
Cuisine: European, Mediterranean, Greek
Ingredients: Kosher salt; 20 oz. cheese tortellini; 5 tbsp. extra-virgin olive oil, divided; 1/4 red onion, finely chopped (about 1/2 cup); 3 tbsp. red wine vinegar; 2 Persian cucumbers, cut into 1/4" half-moons (1 to 1 1/2 cups); 1 1/2 c. cherry tomatoes, halved; 1/2 c. pitted halved Kalamata olives; 1/4 c. fresh dill, finely chopped, plus more for serving; 3 oz. feta, crumbled, divided