For the beef and gravy
01 -
2 tablespoons unsalted butter
02 -
1 small yellow onion, finely chopped
03 -
2 garlic cloves, minced
04 -
2 tablespoons all-purpose flour
05 -
1 1/4 cups (300 ml) beef broth
06 -
1/2 cup (120 ml) whole milk
07 -
1 teaspoon Worcestershire sauce
08 -
1/2 teaspoon kosher salt, plus more to taste
09 -
1/4 teaspoon black pepper
10 -
1 lb (450 g) thin sliced roast beef
For the sandwiches
11 -
4 sturdy sandwich rolls or hoagie rolls, split
12 -
2 tablespoons softened butter, for rolls
13 -
4 slices provolone cheese
14 -
Pickles or pepperoncini, for serving, optional