Do ahead

1. Place butter in a bowl and leave it to soften.
2. Place flaxseed meal in a ramekin and add hot water.
3. Stir and let sit for at least 10 minutes. It will turn into a gelatinous mass.

Make the biscotti dough

1. Preheat the oven to 350 F / 177 C. Line a baking sheet with a silicone baking mat or parchment paper.
2. Cream butter and sugar, then add egg and flaxseed meal and beat in.
3. The result won’t be quite homogeneous, and that is fine.
4. Add in succession the flours (ingredients #6 through #9), sifted, baking powder, salt, Lebkuchen spices and vanilla extract, stirring after each addition.
5. Add the chopped chocolate and almonds and stir until roughly incorporated.
6. Turn the dough onto a floured surface and knead it lightly until it comes together and can be shaped into logs.
7. Sprinkle dough and working surface with the additional all-purpose flour, as needed, to prevent sticking.

Bake the biscotti

1. Divide the dough in half and roll each piece until it is about 12 inches / 30.5 cm long, then move it to the baking sheet.
2. Flatten each log with your hand so that it is about 3 inches / 7.5 cm wide and 1/2 inch / 1.25 cm thick.
3. Bake for 25 minutes.
4. The logs will rise a bit and turn light brown.
5. Take the baking sheet out of the oven. Turn the oven temperature down to 300 F / 150 C and let the logs cool for 10 minutes or so.
6. With a bread knife cut the logs into slices no more than 3/4 inch / 2 cm thick.
7. Move the slices back onto the baking sheet, standing up, leaving a bit of space between each other. Bake the slices for 14 minutes or until desired crispness.
8. Check the biscotti: If the bottom is becoming dark brown, stop the baking, otherwise continue for two more minutes, then check again.
9. When done, take the biscotti out of the oven and let them rest and cool for at least half an hour before tasting.