Name: Lemon Icebox Rounds
Prep time: 30 min
Cook time: 15 min
Cuisine: American
Ingredients: 55g, plus 2 tbsp unsalted butter, room temperature; 55g, plus 2 tbsp icing sugar, sifted; 1 hard boiled egg's yolk; 1 large egg yolk; 1/2 tsp vanilla extract; 310g cake flour, sifted; 1/4 tsp salt; 2 tsp finely grated lemon zest; 90g demerara sugar or yellow sugar