Preheat the oven to 350°F. Weigh out all ingredients. Place almond flour on a baking sheet.
Once the oven is preheated, place almond flour in the oven and toast until golden brown in color, about 8 minutes. Remove from the oven and cool completely.
Combine toasted almond flour, sugar, and salt in a small bowl, and set these dry ingredients aside.
Place your unsalted butter and sugar in the bowl of a stand mixer with paddle attachment. Cream the butter and sugar until it is pale in color and fluffy, about 5 minutes.
Scrape the bowl well before adding egg yolks and almond extract. Mix well and scrape the bowl again, making sure there are no pockets of butter on the sides or bottom.
Add dry ingredients and mix well on low speed until combined. Form tart dough into a ball.
Place the dough ball on a piece of parchment paper, then place an additional piece of parchment paper on top of the ball. Roll out the dough to 1/8 inch thick. Rest in the fridge for 1 hour.
Use a tart ring to cut out the bottom of each tart, repeating until you have 6 tart shell “bottoms.” Use a knife or pizza wheel to cut out 6 strips that are 10 inches long by 1 inch wide. These will be the “walls” of your tart shells. Place each strip inside of a tart shell, making sure the bottom edge meets the bottom of the shell. Trim any additional dough using a small knife. Use a fork to poke the bottoms and sides of each tart shell.
Place the prepared tart shells in tart rings on a parchment-lined sheet tray and into the freezer for 1 hour. Once chilled properly, bake for 15 minutes, or until the tart crust is firm and deep golden brown. Remove from the oven, and cool completely before removing the baked shells from the tart rings.