Preheat your oven to 350F and line a baking tray with parchment paper.
In a large bowl, combine the ground lamb, parsley, garlic, onion, panko crumbs, the egg and the Greek Islands dressing. Mix everything together until smooth.
Shape 24 meatballs, 1-inch in diameter by dipping your fingers in cold water to help shape them and prevent them from sticking to your hands.
Place the meatballs on the prepared tray. Bake them in the preheated oven for 16-18 minutes, or until their internal temperatures reach 170F.
To make the Tzatziki sauce
Grate a third of a long English cucumber or enough to get ½ cup grated. If you want a thicker sauce (or dip) you can drain out excess water from the cucumber with a cheese cloth or paper towel.
In a bowl, combine the Greek yogurt, garlic, parsley, dill, lemon juice, salt, and feta. Add the grated cucumber to the bowl and stir everything together until smooth.
Enjoy the freshly made Tzatziki or refrigerate for a few hours in order to let the flavors intensify.
Serve the meatballs
Serve the meatballs with a handful of spring mix or chopped lettuce, as the tzatziki sauce will serve as both a dipping sauce and a salad dressing.