Pre-heat oven to 175C.
Cut the pita rounds in half and brush the top side generously with olive oil. Sprinkle with sumac and salt.
Place on a lined tray and toast in the oven for 10 to 12 minutes until golden and crisp.
Remove from oven to cool slightly, then break into bite-sized pieces.
Arrange lettuce, tomatoes, cucumber, radish, spring onions and herbs in a salad bowl.
Combine all dressing ingredients in a jar and shake well to combine.
Arrange pita pieces over the top of the salad.
Sumac is a spice made from the ground berries of the sumac bush. It is available from gourmet grocers and Middle Eastern stores, or online.
To turn your salad into a more substantial meal, add a small jar of crumbled Persian feta or 500g of grilled chicken tenderloins.