How to Make It
In a small bowl, whisk the 1/4 cup of olive oil with the garlic, lemon juice, vinegar and dried mint and season with salt and pepper.
In a large bowl, toss the radishes, cucumbers, tomatoes, scallions, parsley and fresh mint. Add the pita, drizzle with the dressing and toss well. Let stand for 5 to 10 minutes.
Add the buttermilk and toss again. Season with salt and pepper. Drizzle the salad with olive oil, sprinkle with the sumac and serve.
Sumac is a popular Middle Eastern spice prized for its super-tangy flavor.