Fit and trim pastry to tin, chill pastry for 30 minutes in the refrigerator.
Then blind bake the pastry shell for 20 minutes.
Meanwhile, make the filling by creaming the sugar and butter until fluffy, add eggs one at a time, continue to beat well then fold in the almond meal and cardamom.
Cool the tart shell and spoon in the batter and flatten the top with a spatula and arrange the slices of ripe apricots to your liking and scatter the hazelnuts and bake for 30 minutes.
When cooked, rest for at least 30 minutes before removing from tin.