Prepare the tzatziki. Add all of the ingredients to a bowl. Toss well then refrigerate so the flavors soak in.
Prepare the scorched rice. Melt butter in a pan over high heat. Add cooked rice, and press down flat with a spatula. Keep pressing down for about 4-5 min or until the bottom is golden and crunchy. Flip and cook 3-4 min more. Remove from heat.
Last make the salad. Add rice to the bottom of a large bowl, followed by lettuce, tomatoes, cucumber, feta, chicken, and pickled onions (if using). Top with tzatziki. Toss to coat well and enjoy!
