Rinse and drain the dried corn kernels, removing any debris or chaff.

In a large pot, take 3 litres of water and dissolve cal by stirring slowly, unheated. Transfer to the stove, add the corn and bring to a rapid boil on high heat. Within a few minutes of boiling, the kernels should begin to turn a bright yellow. Reduce heat and simmer covered for 15-20 minutes.

Remove pot from the heat and cool. Place the covered pot of corn in the refrigerator and allow to soak overnight or for at least 8-10 hours.

The next morning the corn kernels will be swollen and many of the corn skins will be floating on the top of the water. Skim off loose skins. Place the treated corn in a large colander/strainer. Under cold running water, rub kernels between your hands to wash and remove any remaining loose outer skins. Rinse thoroughly at least twice to remove all excess lime. Inadequate washing/rinsing can result in a bitter taste.

Grind the corn in an idli grinder with a little water for quite a while, to get a nice dough with some texture. Knead the masa, adding salt and a little water to obtain a pliable, but resilient dough that can be used for making tortillas, tamales, sopes and other foods. It is best to use fresh masa as soon as possible, because the oil in the corn will rapidly turn rancid. If you want to store the masa for later use, refrigerate in a sealed airtight container for 2-3 days, or freeze well wrapped for up to a month.

To make the tortillas, shape the dough into balls and roll out into a thin disc between two thick stainless steel plates or parchment sheets. Cook on a thick cast iron pan.

Serves 10

Great served with Mexican rice, Mexican beans, stir-fried or grilled Mexican vegetables, chili sauce and salsa.

This is a difficult recipe but turns out really well. It takes over 2 days to make, so needs some planning – just as idlis or dosas  – to make the corn dough, called Masa Harini. The best way to enjoy the freshest and most authentic tortillas and tamales possible is by making fresh Masa Harini.