Pre-heat the oven to 150C/300F/Gas 2.

Grease two baking sheets.

Mix the flour, caster sugar, baking powder and salt in a bowl

In another bowl, whisk the eggs and vanilla together

Stir the wet ingredients into the dry ingredients, then add the almonds

Bring everything together into a sticky dough

Divide the dough in half and form into a flat sausage shape about 25cm (10") long by 5cm (2") wide

Bake in the oven for 35-40 minutes until pale golden - the dough will spread a little

Remove from the oven and slide onto a chopping board and immediately slice into thin pieces about 1cm (½") wide.

Lay the slices back onto the baking sheet and bake for a further 10-15 mins, before turning over and baking for another 10-15 minutes.

Remove from the oven and allow to cool on a wire rack

Store in an airtight container - the biscotti will keep for a couple of weeks