INGREDIENTS
For the cookies:
6 oz
slivered or blanched almonds
1 1/2
oz. chopped hazelnuts
10 oz
confectioners’ sugar
3
large egg whites
1 1/2 tsp
cream of tartar
For the filling:
3/4 cup
unsalted butter, at room temperature
6 tbsp
Nutella
3/4 cup
confectioners’ sugar, sifted
coarse salt