Preheat the oven to 180ºc/160ºc fan
Add the flour, sugar and baking powder to a bowl and mix
Add in the lemon zest and mix again
Add the eggs, slowly, mixing well.
Add the chocolate and nuts and knead through
Press the dough down onto 1-2 lined trays into a long flat log
Bake for 30 minutes
Remove from the oven and cool for 10-15 minutes
Lower the oven temp by 20ºc
Slice the biscotti and lay back onto the trays
Bake for a further 10-15 minutes
Leave to cool fully
Decorate with an icing drizzle and lemon zest
