INGREDIENTS
1 cup
unsalted butter, at room temperature
2
vanilla beans, split lengthwise*
2/3 cup
vanilla sugar**
2
large egg yolks
1 tbsp
vanilla extract
2 1/4 cups
all-purpose flour
1/2 tsp
salt
Turbinado sugar for coating (about ¾ cup)
1
large egg white mixed with 1 tbsp. water