In a large pot, mix in cornmeal, 6 cups of water, sugar, salt, and olive oil. Stir the mixture to combine thoroughly. Allow it to rest for an hour if possible; this helps enhance the flavors and texture.
After the resting period, place the pot over medium heat. Stir constantly, watching as the mixture begins to thicken. When it reaches a boil, lower the heat and continue stirring until the consistency resembles that of cream cheese and starts to pull away from the sides of the pot. When you achieve this, remove it from the heat.
Preheat your oven to 300 ºF (145 ºC). Meanwhile, grease a 9" x 9" x 3" (23 cm x 23 cm x 9 cm) baking pan with extra olive oil to prevent sticking.
Spread half of the cornmeal mixture evenly in the prepared baking pan. This base will hold all the delicious layers together.
Next, cover the first layer with half of the cheddar cheese, allowing it to melt and mingle with the cornmeal.
Now, add your beef filling on top of the cheese, spreading it out evenly. This layer adds richness and depth to the dish.
Follow with the remaining cornmeal mixture, covering the beef completely. This ensures that every bite will contain the wonderful flavors of the casserole.
Finally, sprinkle the other half of the cheddar cheese over the top. This will create a beautiful, melty crust as it bakes.
Place the pan in the preheated oven and bake until the top turns golden brown and bubbly, which usually takes about 30 to 40 minutes.
Once baked, allow the Pastelón de Harina de Maíz to cool for 5 minutes before serving. Garnish it with the tomato sauce and serve alongside a refreshing green salad, such as baby arugula with an olive oil vinaigrette.