Barbecued Mixed Grill with Corn

I am crazy about mixed grills — they are something my mother always made for us and remind me of restaurants in Greece where you can just order lamb chops by the kilo and they come out barbecue-grilled with oregano and a squeeze of lemon. Here I make them with a whole fillet of veal, and potatoes and onions roasted amongst the coals. We love a dollop of sour cream or Greek yoghurt and an extra dr