If you wish to make a lattice for the top, roll out the smaller piece of dough on a well floured benchtop. Roll thinly and cut into 1 1/2 cm wide strips. Gather the scraps and roll into strips. Set aside, covered with a clean tea towel. If you prefer a cake without a lattice, roll the smaller piece of dough into a long sausage the length of the rim of the cake.