I am so angry. I bought a boneless leg of lamb from Costco. It's from New Zealand. I've bought it many times and was looking forward to a lovely roast with potatoes and veg. I cooked it to medium well and when we sat down to eat it we couldn't. It was inedible. It has a bitter flavor. I don't know what to do with it. Can I return it to Costco? Would you? The flavor is terrible.