German Hazelnut Cake Recipe / 450g of ground hazelnuts, 4 eggs, 50g of caster sugar, 250g of dates, 150g of dark brown sugar, soft, 50ml of hot water, 1/2 tsp cinnamon, 1 tsp vanilla essence, 1 pinch of flaky sea salt, 630g of caster sugar, 4 1/4 bronze gelatine leaves, 3 tsp pectin powder, 6 egg whites.