1. Preheat the oven to 350°F (175°C). Line a 10×5 inches (25x12cm) loaf pan with a piece of baking parchment and grease lightly. Set aside.

2. For the streusel mix the flour with sugar (or xylitol) in a bowl. Add the cold butter and rub everything between your fingers until different-sized streusels form. Set aside in the fridge until needed.

3. Add the cold butter and marzipan in small pieces to the bowl of your stand mixer and mix until well combined. Add the sugar and vanilla extract and mix in. Add the eggs one after another and mix well after each addition. Mix the flour, baking powder, and salt and add together with the amaretto to the bowl – mix until just combined. Transfer the batter to the prepared loaf pan, smooth out the top, and sprinkle with the streusels. Bake for about 50-55 minutes or until a wooden skewer inserted into the center of the cake comes out clean. Take out of the oven and let cool down in the pan for some time, then remove and let cool down completely on a wire rack.