Pecan, macadamia and walnut tartlets

Ingredients

• 1 1/4 cup (185g) plain (all-purpose) flour
• 1/3 cup (55g) icing (confectioners') sugar
• 1/4 cup (30g) ground almonds
• 125 gram cold butter, chopped coarsely
• 1 egg yolk
• Filling
• 1/3 cup (50g) roasted macadamias
• 1/3 cup (35g) roasted pecans
• 1/3 cup (35g) roasted walnuts
• 2 tablespoon light brown sugar
• 1 tablespoon plain (all-purpose) flour
• 40 gram butter, melted
• 2 eggs
• 3/4 cup (180ml) pure maple syrup