Abstract: A beverage preparation method, including the following steps: grinding natural hazelnut kernels and water together in a bladed grinder at room temperature; removing sediments by filtering through a sieve with a mesh size of 0.5 mm to obtain a filtrate; cooking the filtrate in a pressurized cooking vessel at 110-150° C., for 1 second to 20 minutes; removing sediments formed after cooking by a centrifuge to obtain a sediment-free liquid. The beverage preparation method solves the stability problems by a heat treatment under pressure and centrifugation steps without using food additives and by the heat treatment under pressure with sugar addition to the product gives it a special flavour.