1. For the tzatziki, combine cucumber and 1 tablespoon salt in a bowl. Set aside for 10 minutes, then squeeze to remove excess liquid. Add remaining ingredients, then stir to combine and season with salt and pepper.
2. Preheat pan with 1 tablespoon olive oil to medium high heat. Cook skewers 4 minutes per side for a total 16 minutes or until cooked through. Set aside.
3. Warm flatbread in the pan, top with tzatziki, rocket, onion and a squeeze of lemon juice.