In a medium bowl, combine all of the tzatziki ingredients together, mix well. Refrigerate until ready to use. The sauce can be made the day before, best if made a few hours ahead!
Bake or microwave naan dippers as directed on the packaging, but can be served room temperature after baking.
Add meatballs, water, and oregano flakes to a medium microwavable bowl. Heat meatballs until warmed through, about 5-6 minutes, stirring every couple minutes. Meatballs can be heated from frozen state, just add a few minutes for microwave time. Season with black pepper if desired.
Slice the other half of the cucumber in about 1/2 inch slices, and then quarter each slice so you're left with 4 triangle shapes for each slice, you'll only need about 20, or however many skewers you are making.
Spread desired amount of tzatziki onto each naan dipper. Sprinkle each with feta cheese. Skewer a meatball, cucumber, and half of a cherry tomato onto a toothpick, and place into the naan. Repeat until all naans are used.
This recipe can be modified by however many naan dippers you have. I find the naan dippers next to the hummus in my local grocery store. If you can't find the dippers you can buy full sized naan and slice into rounds or squares.
I love mine with added sriracha into the yogurt for a little spice!
Make sure you use oregano flakes, not ground oregano. Ground oregano is much more potent. Fresh could be used as well.