Method

1. For the biscotti base, preheat the oven to 160C/325F/Gas 3 (do not use the fan on your oven).

2. Mix together the flour, baking powder and sugar in a bowl and add the eggs slowly to make a dough.

3. For the pistachio and cranberry biscotti, add the nuts, cranberries and lemon zest at this point.

4. For the hazelnut and date biscotti add the nuts, dates and lemon zest at this point.

5. For the chocolate, almond and orange biscotti, add the tepid melted chocolate to the base dough and mix in thoroughly before adding the chocolate chips, almonds, orange zest, and vanilla essence.

6. Knead the mixture gently and then separate and roll into two logs. Place on a lined baking tray and bake for 25 minutes in the preheated oven.

7. Cool slightly and cut into 1-2cm/½-¾in thick slices.

8. Return to the tray to the oven and bake for another 10-15 minutes, turn over and continue to bake for another 10-15 minutes until golden-brown.

9. For the mocha sauce, combine all ingredients in a heavy-based saucepan and heat them gently, stirring constantly until all the marshmallows and chocolate have melted.

10. Serve the hot mocha sauce in a cup with the biscotti on the side to dunk in.