Step 1

To make the dressing, in a large bowl whisk together olive oil, red wine vinegar, Dijon mustard, oregano, and salt and pepper to taste (I like ½ teaspoon salt and ¼ teaspoon pepper).

Step 2

To the bowl with the dressing, add the diced cucumber and sliced red onion and marinate at least 5 minutes or up to 30 minutes.

Step 3

In a large pot, bring 4 quarts of water and 1 tablespoon salt to a boil. Add pasta and cook until tender, about 8 to 10 minutes. Drain well, rinse with cold water, and drain again.

Step 4

To the bowl with the dressing, and the cooled pasta, tomatoes, and Kalamata olives. Toss to combine and sprinkle with feta cheese.