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Get ready for a belly-busting feast. More than 300 restaurants are dishing out discounts to mark National Burger Day. Download your 20% off discount voucher from the Mr Hyde website then decide if you want the Butchie’s buttermilk chicken and blue cheese offering, a prawn and beef pairing from GBK or a burger served in a doughnut-shaped bun from Heliot Steakhouse –just some of the interesting takes on the traditional burger. There are animal-free versions too for the veggies out there. Go forth and get greasy.