To make the feta tzatziki spread, you want to use so-called European cucumbers, which are seedless and have a tender skin.
For the lamb sliders:1.
Heat olive oil in a grill pan over medium pan. Take your slices of lamb and put them in the grill pan.2.
Cook the lamb for about 2 to 3 minutes until it's reheated.3.
Cut the pitas in half. Schmear each half generously with the feta tzatziki spread. Top one half with the lamb, then tomatoes, sliced onions and spinach. Place the other pita half on top.
For the feta tzatziki spread:1.
Combine the yogurt, feta, vinegar, garlic, mint, dill and cucumbers.2.
Season with salt. Let sit for at least 1 hour at room temperature before serving.