2 sticks unsalted butter (1 cup) at room temperature
¼ cup sugar
1 teaspoon vanilla extract
¼ teaspoon almond extract
10 ounces of raspberry jam or preserves
1 9-10 inch tart pan with a removable bottom
Toast, skin and grind the hazelnuts Preheat oven to 350ºF. Place hazelnuts on a small baking tray in a single layer. Bake for 12-15 minutes, until they darken and some skins begin peel away. Pour the nuts onto a kitchen towel. Fold the towel over the nuts and rub them between the sides of the towel to rub off most of the flaky skins. Pulse the nuts in a food processor until you get a coarse grind. Measure out 1 1/4 cups ground nuts. (you might have some left over)
Mix dry ingredients In a medium-sized bowl, combine flour, cocoa powder, baking powder, cinnamon, and salt. Set aside.
Mix wet ingredients Using a large mixing bowl, with an electric mixer, mix the butter and sugar until well integrated. Add ground nuts. Mix to combine. Beat in egg, vanilla and almond extract. Set the mixer on low and add the dry ingredients, 1/3 at a time, stopping to scrape down the sides of the bowl as needed. When all ingredients are fully incorporated, form the dough into a ball, cover with plastic wrap, and refrigerate for at least 4 hours.
Take dough out of fridge and let it sit at room temperature until it can be molded (15-30 min) Form dough into a thick log and use about 1/3 of the log to form the bottom crust. (note, there is more than enough dough so feel free to add extra if needed) Press the dough evenly into bottom of the tart pan and up the sides. Crust should be about 1/4 inch thick. You want the crust to go only halfway up the sides of the pan, but in order to get a nice side crust with an even flat rim, press the dough all the way up the sides of the tart pan and then use a finger to push it down to half way. Form a ball with remaining dough. Place it on a large piece of waxed paper and press into a 9 inch disc. Cover with another large piece of waxed paper. With a rolling pin, roll dough into a 1/4 inch thick circle. (You can slide a piece of cardboard underneath to help transport the dough) Put the tart pan and the rolled dough into the fridge for about an hour, until firm.
Remove tart pan from fridge. Preheat the oven to 350F. Spread jam evenly to cover the bottom crust.
Remove rolled dough from fridge. peel off top waxed paper. Cut a circle the size of the tart pan. (you can use the pan as a stencil) Using a sharp knife cut a wavy line down the center of the circle. Peel away one half of the circle and save for making cookies, if you like. With the remaining half circle of dough, use a heart-shaped cookie cutter or try cutting hearts free-hand. Cut out 5 hearts or as many as you like in a nice design, setting the cut out hearts aside. If you need to make any repairs, do so before you place the design on the tart. Carefully lift the crust to cover half of the tart, gently joining the crust to the side dough, using your fingers. Place cut out hearts on the other side of the tart.
Bake in the middle of the oven for about an hour, or until the jam is bubbling and the crust is beginning to brown.
Remove from oven and cool on a wire rack for 15-20 minutes. When cool enough to handle, remove tart from the outer rim of the tart pan and cool completely.