Mint, cumin, paprika, grated onion, and tender ground lamb make easy and super flavorful meatballs. The cayenne is completely optional, but those who like more intense flavors will appreciate its gentle presence; it doesn't make these meatballs spicy, it just adds a bit of extra je ne sais quoi. Proper browning is the most important element of these meatballs, so be sure to cook them in a single, spacious layer, working in batches, if necessary. Serve them with rice, rice pilaf, or pita bread with some yogurt tahini lemon sauce on the side. A simple, crisp green salad is a winning touch.