In a food processor, or with a wooden spoon, mix together the dry ingredients.

Mix in the eggs.

Mix in the butter (softened to room temperature), either with short pulses of the food processor or with your fingertips, until an smooth dough forms. Add a little more flour if necessary.

Form into a ball and leave in a lightly floured bowl for 30 minutes.

Turn out onto a lightly floured bench.  Take pieces about the size of a walnut and roll then into sausages about 10cm (4 in) long.

Place on a tray covered with baking paper and curve them into a cresent shape.  Flatten them slightly, and run over the top of the cookies gently with fork prongs to make the grooves on them.

Bake at 200ºC (400ºF) for 18 - 20 minutes.