Lightly toast beans and almonds (separately) in a cast iron frying pan. Finely chop all the almonds in a kitchen whiz, coarsely chop half the espresso beans with a knife (don't forget to sharpen it again afterwards!) and use a coffee grinder to turn the remainder into fine grounds.

In a large bowl, add the flour, baking powder and salt and rub in the butter. Now add all the remaining ingredients and mix well. Knead for about 2 minutes, and shape into four small, oval rolls. Lightly dust, and pop into oven for 25 minutes. When cool, cut into thin slices and lay sideways on a tray and bake for another 8 to 10 minutes until the slices are hard and crisp.

When cool, transfer to an air-tight container.