For the Ground Beef Mixture:

1. Heat a large skillet over medium heat and add the bacon. Cook until crispy and rendered. Remove and set aside.
2. To the same pan, add the ground beef. Cook for a few minutes, breaking it up with a spoon or spatula, and then add in the taco spice, ketchup, mustard, Worcestershire, and pickle relish. Mix everything in well.
3. Cook for 5 minutes, stirring frequently, or until the beef is cooked through and mixture is homogenous and sort of saucy. Season, to taste, with salt and pepper.
4. Allow the mixture to cool slightly.

For the Cheese Sauce:

1. While the beef is cooking, heat a saucepan over medium heat and add the butter. Once it melts, add the flour and whisk well. Cook for 2 minutes.
2. Whisking constantly, slowly stream in the milk. Cook, stirring frequently, for a few minutes or until the mixture thickens enough to coat a spoon.
3. Whisk in the cheeses and stir until melted. Season, to taste, with salt and pepper. Keep warm until you are ready to serve.

For the Tacos:

1. Prep all your toppings and set them in bowls so that everyone can create their own tacos. Serve while the beef and cheese sauce are still warm.
2. My favorite taco consists of flour tortilla (toasted over my stove gas burner) filled with the beef, cheese sauce, crumbled bacon, sliced avocado, tomatoes, lots of fresh lettuce, a couple sliced radishes, a sprinkle or herbs, and a healthy spritz of lime juice.