Susan Edmunds of RNZ When it comes to butter, paying more doesn't necessarily pay off, a new taste test shows. Consumer NZ ran a blind taste test of 11 types of butter available to New Zealand shoppers. It said the worst rated was a Market Kitchen block of butter for sale at The Warehouse for $5.99 per 400g block. The butter was made in New Zealand, but only had a two-out-of-five-star rating on The Warehouse website too. It was the second-cheapest of the blocks tested, but samplers noted a "strange aftertaste". The controversial US butter Burtfields & Co was second-worst. It was the cheapest butter tested at $6.99 per 500g. "People were able to tell it was the American butter just based off the colour," Consumer NZ spokesperson Vanessa Pratley said.  "I tried it myself and a couple of other tasters also said it's just butter." Pricier options did not fare as well as you might expect. Lewis Road butter, which cost $8.99 per 250g at Woolworths this week, was third from the bottom.…