Add oil to a pot and add the pork cracklings.

Once the cracklings are warmed through, add the chopped serrano pepper, tomatoes, and onion (cut into small cubes).

Next, add the tomato puree and water (add as much water as you like). Season with salt.

Let it cook for about 10 minutes until it comes to a boil. Enjoy this delicious dish! You can serve it with refried beans and cheese.