Venezuelan
Mix the warm water with the salt and 1 tsp of the oil, then gradually add the corn flour, stirring with your hand to break up any lumps.
Knead for 2 minutes into a soft, smooth dough that does not crack at the edges, adding a little water if needed, and rest it for 5 minutes.
Divide the dough into 5 balls and flatten each into a disc about 10 cm wide and 1.5 cm thick.
Heat a griddle or heavy frying pan over medium heat and brush it with the remaining oil.
Cook the arepas for 6-8 minutes per side until a firm golden crust forms, then finish them in a 180C oven for 10 minutes until they sound hollow when tapped.
Split each hot arepa along the side with a knife to make a pocket.
Spread the inside with butter, fill with the grated cheese and serve warm.