Take grated cucumber and squeeze excess liquid using hands first and then wrap in a paper towel and remove even more liquid. Place in a small bowl and add in all other ingredients. Mix until combined and then place in the fridge until ready to serve.
Cut lamb steaks into 1-inch cubes. Slice peppers and onions into 1-inch squares. To make your skewers, start with one piece of lamb, one pepper, and one onion and repeat two more times, ending with one last piece of lamb.
Heat a grill or grill pan on high and lightly spray your skewers with a cooking oil (I used avocado oil). Once hot, add skewers making sure not to overcrowd your pan (work on batches if need be). Cook for 3 minutes on one side, flip and cook for another 3 minutes.
Remove from grill and enjoy with your tzatziki sauce!
Pita bread
Roasted cherry tomatoes: drizzle tomatoes with olive oil, salt and pepper in a baking dish or cast iron pan and roast in the oven at 375 degrees F for 35-45 minutes.