Makes 100
30g icing sugar
30g cornflour
9 sheets gelatine
450g granulated sugar
1 tbsp liquid glucose
2 egg whites
1 tsp vanilla extract
1 Line a 20cm x 30cm tin with baking paper.
2 Sift together the icing sugar and cornflour and sprinkle half into the tin.
3 Put the gelatine into a large glass jug with 150ml water and set aside.
4 Put the sugar, glucose and 200ml of water into a pan and bring gently to the boil, stirring until the sugar dissolves. Boil vigorously for 10 minutes without stirring until the syrup reaches 125C on a thermometer.
5 Meanwhile, whisk the egg whites until stiff.
6 Take the syrup off the heat and let the bubbles subside. Carefully pour the syrup into the gelatine jug and mix well.
7 With the beaters switched on, steadily pour in the hot syrup and the vanilla. The mixture will slacked but keep whisking on full speed (5 - 10 minutes) and once it's nicely thickened, pour into the prepared tin. Leave to set for a couple of hours.
8 Peel off the parchment and cut into squers, rolling them in the reserved icing sugar mixture. Store in an airtight container.