
Preheat the oven to 350° Fahrenheit or 180° Celsius.
In a small saucepan, melt the butter over a low heat. Make sure not to burn it. Let it cool for a few minutes while you prepare the other ingredients.

In a medium mixing bowl, mix flour, salt and baking powder together.

In a separate mixing bowl, using a whisk or hand mixer, mix together the egg yolks, whole egg, sugar, lemon zest, Sambuca, vanilla, and warm water.

Add the melted butter and continue mixing the wet ingredients together.

Combine all the ingredients together, the dry ones with the wet ones.

Work the dough with your hands until all the ingredients are combined.

Add the sliced almonds and using your hands, work them into the dough.

Knead the dough some more to incorporate the almonds.

Take the mixed dough and separate into two equal parts.

Roll each part into a long roll and place each roll side by side on a perchmant lined cookie sheet.

Bake for 30-35 minutes.

Remove from the oven and using a very sharp knife cut diagonally 1 inch (2.5 cm) thick pieces.

Place them face up on the cookie sheet and bake them for another 15 minutes.

Remove from the oven and let the freshly baked biscotti cool off for at least 20 minutes before serving.
