To make the dough, mix margarine and lard and set aside.
Mix flour, salt and water in a bowl.
Knead and form a smooth dough.
Form the dough ball into a rectangle (lengthways) with your hands. Roll over it several times with the rolling pin until the dough is approx. 2 cm thick.
Roll the rectangle in, then turn it 90 degrees so that it lies lengthwise.
Repeat the process of rolling out, rolling up and twisting 8-10 times. This creates an elastic, firm dough.
Form the dough into a ball and spread it with a quarter of the margarine-lard mixture (with your hands).
Place the dough in a freezer bag and chill for about 1 hour.
Take the dough out of the fridge. It should no longer spring back when touched.
Using your hands, press the dough into a rectangle, this time across. One hand lies in the middle of the dough while the other hand stretches and pulls the dough longer on one side.
Switch hands and extend the dough to the other side. Pull until the dough is about 50cm long and 15cm wide.
Now roll out the dough to 70cm long and 20cm wide.
Spread the margarine-lard mixture over the dough, but reserve a quarter of it.
Roll carefully from the narrow side. At the same time, carefully pull back the dough and make it thinner. Pull carefully to avoid tearing the dough and roll tightly to avoid air bubbles.
The roll may end up being thinner and the middle thicker.
If this is the case, fold or push in the ends so that the roll has a similar diameter throughout.
Spread with the remaining margarine and lard mixture.
Wrap with cling film and chill overnight.