In a bowl, mix the cornmeal, salt, milk and butter.
1 cup Precooked cornflour, 1 cup milk, 1 teaspoon salt, 2 tablespoon Melted butter
Knead the mix until smooth ball forms.
Cover with a towel and let it rest for 10 minutes.
Form clementine size balls and flatten them with a plate of tortilla press.
You should have 6 discs about 5 inches in diameter.
Add mozzarella cheese to the center of one of your discs and cover with an additional corn disc.
1 cup grated mozzarella cheese
Secure the edges by pressing them down and inward. Making sure all the edges are closed so the cheese won't ooze out when cooking.
Add the oil to the cast iron skillet and heat over medium-high heat
1 tablespoon vegetable oil for cooking
Add the arepa to a hot pan or cast iron skillet.
Cook on medium high for about 3-4 minutes per side.
Serve immediately, add more butter on top for serving if desired