Heat the oven to 170°C.
Place the sugar, flour, butter, eggs, yeast and grated lemon rind in a bowl. Mix well until the mixture is smooth.
Add the nuts and mix again.
Divide the dough into four equal parts and spread it in rectangles measuring 7 x 25 centimetres on an oven tray covered with greaseproof paper.
Cook for about a quarter of an hour until golden all over.
Remove from the oven and cut into small portions of 1 centimetre.
Return them to the oven until they are crisp and golden. Once cooked, remove and allow to cool, then store in an airtight box.