Supermarkets and restaurant chains are selling halal meat to millions of customers without telling them. The switch to slaughtering animals in line with Islamic ritual saves money because the end product can be eaten by Muslims and non-Muslims alike. More than 70 percent of all New Zealand lamb in supermarkets is from halal abattoirs—a fact not stated on labeling. Tesco, Sainsbury’s, Morrisons, Waitrose and Marks & Spencer all confirmed yesterday they sell the imported meat. …