Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it to prevent sticking.
In a large mixing bowl, combine the ground lamb, egg, breadcrumbs, chopped parsley, chopped mint, grated onion, allspice, cumin, cinnamon, black pepper, and salt. Use your hands to mix everything together until just combined. Be careful not to over-mix, as this can make the meatballs tough.
Using a spoon or an ice cream scoop, portion out the mixture and roll it into meatballs about 1 to 1.5 inches in diameter. Place them evenly spaced on the prepared baking sheet.
Bake the meatballs in the preheated oven for about 20-25 minutes, or until they are browned and cooked through. You can check for doneness by ensuring the internal temperature reaches 160°F (70°C).
While the meatballs bake, prepare the yogurt sauce by combining the plain yogurt, chopped fresh mint, minced garlic, lemon juice, and a pinch of salt and pepper in a bowl. Mix until smooth and creamy.
Once the meatballs are out of the oven, let them cool for a few minutes before serving. Serve the Lamb Meatballs with the mint yogurt sauce on the side for dipping. They also pair beautifully with rice or in a pita.
