Make the Tzatziki sauce first: make sure to squeeze out all the excess liquid from the cucumber after grating. In a small bowl, mix all sauce ingredients thoroughly and refrigerate.
Prepare and slice all wrap ingredients.
On a flat surface, spread one collard green leaf. Spread 2 tablespoons of Tzatziki sauce on middle of the leaf.
Layer ¼ of each of the tomatoes, feta, olives, onion, pepper, and cucumber. Place them on the center of the leaf, like piling them high instead of spreading them.
Fold the leaf like you would a burrito. Repeat process for remaining ingredients. Serve and enjoy.