Instructions:

• Step 1: Preheat your oven to 180°C (350°F) to ensure it's hot enough for baking the tart crust.
• Step 2: Roll out the shortcrust pastry and fit it into your tart pan. Trim any excess pastry and prick the bottom with a fork to prevent bubbling. Chill in the fridge for 15 minutes.
• Step 3: Line the chilled pastry with parchment paper and fill with baking beans or rice. Bake for 15 minutes, then remove the beans and parchment. Bake for an additional 5 minutes until golden. Let it cool.
• Step 4: In a mixing bowl, combine the butter and sugar, beating until creamy. Add the egg and egg yolks, mixing until well combined.
• Step 5: Melt the dark chocolate over a double boiler or in the microwave, stirring until smooth. Allow to cool slightly before adding it to the butter mixture.
• Step 6: Incorporate the Nutella, finely chopped almonds, and orange zest into the mixture, stirring until everything is well combined.
• Step 7: Pour the filling into the cooled tart shell, smoothing the top with a spatula.
• Step 8: Bake the tart for 20-25 minutes, or until the filling is set but still slightly wobbly in the center. Allow it to cool completely in the pan.
• Step 9: Once cooled, dust with powdered sugar for a beautiful finish. Slice and serve, preferably with a dollop of whipped cream or a scoop of vanilla ice cream for an extra treat.