Instructions
1Whisk olive oil, lemon juice, garlic, oregano, salt, and pepper. Toss with the chicken and marinate at least 30 min (up to overnight).
2While the chicken marinates, make the Greek salad: toss cucumbers, cherry tomatoes, red onion, and feta with red wine vinegar and olive oil. Chill until serving.
3Thread the chicken onto skewers and grill (or grill-pan) over medium-high heat, turning occasionally, 8–10 min until cooked through and lightly charred. Let rest 3–4 min off heat, then squeeze fresh lemon juice over the skewers before serving.
4Warm the pita on the grill the last minute or two. Serve the skewers with pita, tzatziki, and the Greek salad.