Combine 11 oz/310 g of the sugar, the water, and glucose syrup in a heavy-bottomed saucepan and stir to ensure all the sugar is moistened. Bring to a boil over high heat, stirring to dissolve the sugar. When the syrup reaches a boil, stop stirring and skim the surface to remove any impurities. Continue to cook without stirring, occasionally washing down the sides of the