Portillo's Italian Beef Hack

1/4 cup beef tallow
4 cups water
4 teaspoons Better Than Bullion Beef Base
1 1/2 teaspoons Kitchen Bouquet Browning & Seasoning Sauce
1 teaspoon lemon juice
1/2 teaspoon dried oregano
1/4 teaspoon salt
1/4 teaspoon ground black pepper
1/8 teaspoon garlic powder
1/8 teaspoon ground cayenne pepper
Pinch of MSG
1 pound roast beef

Make the beef gravy by combining all of the ingredients, including the beef fat, in a medium saucepan over medium heat. When the mixture begins to boil reduce the heat and simmer for 5 minutes, then turn the heat to low.

For each sandwich, drop 1/4 pound of sliced beef (separate the slices) into the gravy for 2 minutes. Make sure the gravy isn't boiling. It should be around 180 degrees F. After the beef has soaked in the gravy, use tongs to arrange the beef on a warmed sandwich roll and top with your choice of hot giardiniera or sweet peppers. Or both. Spoon on some extra gravy just before serving.