100 grams Ground hazelnut
200 grams Powdered sugar
80 grams Egg whites
40 grams Caster sugar
Pinch of salt
Step 1 In a mixing bowl whisk together the ground hazelnut and powdered sugar until completely blended. Line 3 baking sheet with parchment paper.
Step 2 In your stand mixer fitted with the whisk, beat the egg whites and pinch of salt until foamy, gradually add the sugar and continue beating until soft peaks appear.
Step 3 Fold in the ground hazelnut mixture in two additions until your get a slow moving batter. Fill a pastry bag with the batter and pipe small amounts of batter 3 cm in diameter, 2 cm apart. Leave to rest for 1 hour. Spoon the filling on one shell and sandwich with another one.