Prepare the Ground Beef Filling:

1. Heat the Oil: Heat olive oil in a large skillet over medium heat. Once hot, add the chopped onions and sauté for about 2-3 minutes until softened and translucent.
2. Cook the Garlic: Add the minced garlic to the pan and cook for another 30 seconds, stirring constantly to avoid burning.
3. Brown the Beef: Add the ground beef to the skillet, breaking it apart with a spoon or spatula. Cook for 5-7 minutes, until the beef is browned and no longer pink. Be sure to drain any excess fat from the beef.
4. Season the Meat: Stir in your taco seasoning (or homemade seasoning mix) and cook for 1-2 minutes to toast the spices. Add the tomato sauce (or salsa) and water, stirring well to combine.
5. Simmer: Reduce the heat to low and let the mixture simmer for 5-10 minutes, allowing the flavors to meld together and the sauce to thicken slightly. Stir occasionally.

Warm the Tortillas:

6. Heat the Tortillas: While the beef simmers, heat your tortillas. You can either warm them in a dry skillet over medium heat for 30-60 seconds on each side or wrap them in a damp paper towel and microwave for 20-30 seconds until soft and warm.

Assemble the Tacos:

7. Fill the Tortillas: Spoon the seasoned ground beef mixture onto the center of each warmed tortilla. Be generous, but leave a bit of space at the edges to fold them.
8. Add Toppings: Top each taco with your desired toppings, such as shredded lettuce, diced tomatoes, shredded cheddar cheese, sour cream, cilantro, and a squeeze of lime juice. You can also add jalapeño slices for a little extra heat.

Serve and Enjoy:

9. Serve: Arrange the tacos on a platter and serve with additional lime wedges and any extra toppings on the side.