Preheat oven to 350 degrees F and line two baking sheets with parchment paper or a silicone mat.
With an electric or stand mixer, cream butter with sugar and salt until light and fluffy.
Add egg yolk and almond extract and beat until homogenous.
Add all purpose flour and almond flour and gently mix until mixture comes together in a dough.
Use a two tbsp cookie scoop or other spoon to roll small cookie dough balls and place on your prepared baking sheets.
Gently press the back of a 1/2 teaspoon measuring spoon to create small craters in the middle of each cookie.
Scoop a rounded 1/4 teaspoon of yuzu curd into each crater.
Chill cookies in the fridge for 20 minutes (see notes about whether you want to risk skipping this step).
Bake for 12-15 minutes, or until bottom of the cookie becomes lightly browned. Because of the curd, I keep these cookies in an airtight container in the fridge if not being eaten the day of baking. Allow cookies to come to room temperature before eating.