Heat 1 tablespoon of oil in a large skillet over medium heat. Add the finely chopped onion and sauté for about 2-3 minutes until it becomes translucent and fragrant.

Add 1 pound of ground beef to the skillet, breaking it apart with a spatula. Cook for about 4-5 minutes, stirring occasionally, until the meat is browned and fully cooked.

Stir in 2 tablespoons of taco seasoning and 2 tablespoons of tomato paste. Pour in 1/4 cup of water or beef broth. Cook for an additional 3-4 minutes.

On a clean surface, lay out a 6-inch flour tortilla. Spoon a generous portion of the beef filling onto the center, followed by a sprinkle of shredded mozzarella cheese. Fold and seal the edges.

In a clean skillet, heat 3-4 tablespoons of oil over medium heat. Fry the tacos for about 1 minute per side or until golden brown and crispy.

Transfer the fried tacos to a wire rack to cool slightly and drain any excess oil. Garnish with cilantro and serve immediately.