Step 1

Preheat the oven to 375ºF (190ºC).

Step 2

Make the frangipane by beating the butter and sugar in the bowl of a stand mixer fitted with the paddle attachment until fluffy – about 1 minute on high speed. Add the eggs one by one, stopping the mixer and scraping down the sides of the bowl after adding each. (You can also make it by hand, beating the butter and adding the other ingredients, in a medium bowl, using a spatula.)

Step 3

Remove the bowl from the mixer and stir in the almond flour, then the rum or vanilla extract, almond extract, and salt. Spread the frangipane in the cooled tart dough. Halve the nectarines and slice them into eighths. (The slices should be about 2 1/2-inch, 6cm thick.) Press the slices into the frangipane, in concentric circles, and press the raspberries into the frangipane, in between the nectarine slices.

Step 4

Bake for 30-35 minutes, or until the tart is golden brown across the top. Let cool, then brush lightly with apricot jam, if desired. If it’s not liquid enough to brush on, warm the jam gently in a small saucepan.