Crisp of Napoleon sour sweets

In the Netherlands, the Napoleon sour boiled sweet is an institution. This traditional sweet is a small, hard, ball-shaped sweet wrapped in cellophane. They are now available in many different colours and flavours such as lemon, orange, salty liquorice, and apple. The exterior of the lozenge is hard and made of sugar but the centre is filled with a white, extremely sour powder that is released once the outer layer of sugar has melted away. This lozenge is a combination of sweet and sour flavours with a brittle confectionery that makes it the perfect fresh and crunchy garnish for a dessert. 

Makes 250g.