Put the lamb mince, breadcrumbs, cumin, coriander, garlic, half the feta, half the mint and egg in a large bowl and season with salt and pepper. Using damp hands, combine well, then shape into walnut-sized balls. Then heat the first measure of oil in a medium-deep frypan over medium-high heat. Cook the meatballs, turning, for 3-4 mins, until browned. Remove from the pan.