Excellent sandwich! I used regular dark raisins and Panko breadcrumbs (they were the only kind I could find for some reason). Otherwise followed the recipe, cooking for 9 minutes total. The meatballs were super tender, juicy and flavorful and I liked the hint of sweetness from the raisins. I agree that Greek yogurt is a must here and while I tend to not like mint with lamb, in this case it definitely works with the other flavors. Thanks for sharing!