Place the lamb in a bowl with the rosemary, oil and lemon and season with salt and pepper. Stir to combine well. On to 8 skewers place the lamb, pepper and red onion evenly.
Heat a barbecue or frying pan to a high heat. Cook the skewers for 4 minutes each side or until done to your liking.
To make the Greek salad, combine the onion, tomatoes, olives, cucumber and parsley in a bowl and serve with the feta on top and a drizzle of oil.
To make the tzatziki, combine the yoghurt, garlic, cucumber, mint and lemon juice and stir.
Serve the skewers with Greek salad, a squeeze of lemon and tzatziki.