In a food processor, pulse together hazelnuts, butter, maple syrup and brown sugar until crumbly. Divide mixture among four 10-cm (4-inch) non-stick tart shell moulds, pressing evenly into bases.
Bake for 13 to 15 minutes until fragrant and golden brown. Let cool and remove from moulds.
In a medium bowl, combine strawberries with liqueur; spoon 100 ml (1/2 cup) into the base of each tart.
Pipe or spoon 50 ml (1/4 cup) of the whipped cream onto each tart and top with large strawberries.