Chocolate Truffle Tarts

Ingredients

• 1 stick (113gr) unsalted butter, at room temperature
• 1/2 cup (60gr) unsifted powdered sugar
• 3 egg yolks
• pinch of salt
• 1 cup (160gr) white rice flour
• 1/4 cup (30gr) amaranth flour (you could use sorghum flour)
• 1/4 (40gr) potato starch
• 1/4 cup (20gr) unsweetened cocoa powder
• 8 ounces (240gr) bittersweet chocolate
• 12 tablespoons (170gr) unsalted butter, at room temperature
• 1/4 (50gr)cup sugar
• 1/4 cup (60ml) strong brewed coffee
• 4 large eggs
• 4 ounces (120gr) bittersweet chocolate
• 1/3 cup heavy whipping cream
• 2 tablespoons unsalted butter, at room temperature