Mint Potatoes with Sweetbreads and Herb and Onion Salad

If offal makes you squeamish, get over it! Veal sweetbreads (the gland from the thymus or pancreas) are prized for their mild, velvety texture and they ramp up the flavour of this dish big time. For za’atar, a spice blend of sesame seeds and herbs, you can make your own, or buy it ready-made at spice shops or Middle Eastern grocers.