Linzertorte - La cuisine de Bernard

Ingredients

• 275 g flour
• 210 g butter
• 55 g hazelnut (powder)
• 55 g sugar
• 1 pinch of baking powder
• 1/2 teaspoon cinnamon (powder)
• 100 g egg yolks ((about 5))
• 1/2 cap of rum ((optional))
• 1 jar of blueberry, (raspberry, red fruit jam...low in sugar)