INGREDIENTS
1 1/2 cups
high-quality all-purpose gluten-free flour
3/4 tsp
xanthan gum (omit if your blend already contains it)
2 1/2 cups
confectioner’s sugar
1/8 tsp
kosher salt
8 tbsp
unsalted butter, at room temperature
4 tbsp
vegetable shortening
Scant 1 cup egg whites (from about 6 extra-large eggs – or buy those egg white only cartons)
2 tbsp
pure vanilla extract
2 tbsp
freshly squeezed lemon juice
1/2 cup
heavy cream (or high fat nondairy milk)
8 oz
semisweet chocolate, roughly chopped