Step 1

In a saucepan over medium heat, melt the butter.

Step 2

Add the flour and whisk constantly for 1-2 minutes (or until the mixture turns light brown).

Step 3

Remove from heat and gradually pour in the warm milk, whisking constantly.

Step 4

Return the pan to the heat, and whisk for another 3-5 minutes or until thickened.

Step 5

Add the salt, garlic powder, ground mustard, and cayenne pepper and stir to combine. Remove from heat.

Step 6

To avoid lumps, slowly add the cheese, stirring constantly as it melts.

Step 7

Pour the cheese sauce over the top of the cooked elbow macaroni. Stir to combine.

Step 8

Place the warmed shredded beef meat on the macaroni and cheese and then pour the warmed juice over the meat. Add onion, jalapeno, and cilantro.You can serve it like this (with the meat on top) or combine all ingredients so they are fully incorporated.