The meatballs started with a few fresh ingredients but most importantly the SimplyNature Organic Grass-Fed Ground Beef from ALDI. You might get your hands dirty on this recipe. The key to meatballs is not over mixing as it can cause the meatballs to be tough and no one likes tough meatballs. Meanwhile, make your Homemade Tzatziki Sauce using Friendly Farms Plain Greek Nonfat Yogurt and cucumbers. This is an important step in making Homemade Tzatziki, be sure to ring out most of the water from your shredded cucumber.