How to Make It
Preheat the oven to 425°. Brush 2 large baking sheets with olive oil. Arrange the pitas cut side up on the baking sheets and brush with olive oil. Bake in the upper and lower thirds of the oven, shifting the sheets, for 8 to 10 minutes, until lightly toasted and crisp.
Meanwhile, in a large bowl, combine 2 tablespoons of the mint with the scallions, cumin, cinnamon, pine nuts, egg, 1 1/2 teaspoons of salt and 1/2 teaspoon of pepper. Add the lamb and knead until evenly combined. Spread each pita with a slightly rounded teaspoon of the meat mixture and bake for about 8 minutes, shifting the baking sheets, until the lamb is cooked through.
Meanwhile, in a small bowl, whisk the yogurt with the 1 1/2 teaspoons of chile oil and the remaining 2 tablespoons of mint and season with salt and pepper. Spoon small dollops of the yogurt onto the pizzettes and garnish with a drop of chile oil. Serve right away.