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Adjust rack to top position and preheat oven to 425 degrees. (TIP: If you have a toaster oven, feel free to skip preheating—you’ll use it to warm the pitas in step 5.) Wash and dry produce.
Trim and halve cucumber lengthwise; thinly slice crosswise into half-moons. Dice tomato. Halve, peel, and thinly slice half the shallot; mince remaining shallot. Pick and roughly chop fronds from dill. Quarter lemon. Peel and mince or grate garlic.