Add butter to a medium-sized saucepan over medium-high heat. Once butter melts, add in onions, and cook till translucent, about 5 minutes.
Add flour to cooked onions and cook for an additional 2 minutes while whisking to cook the flour taste out. Add in coriander and black pepper and whisk together with beef broth and Worcestershire sauce. Reduce heat to low and let simmer while you prepare the sandwich.
Pile finely sliced or chopped pastrami onto bottom bun. Put on a baking sheet and place in a 400 degree oven for 5 minutes. Top pastrami with cheese and return to oven for an additional 5–7 minutes or until cheese has evenly melted. While cheese is melting, spread mustard on top portion of bun, and pour au jus into small bowl.
Remove sandwich from oven, top with pickles and top bun. Slice in half and serve with au jus and chips.
This French dip pastrami sandwich recipe was inspired by a restaurant I used to hit at least once a week when I lived in Southern California called “The Hat.” You’ll see plenty of recipes influenced by my time in SoCal, like these San Diego style tacos, but today’s recipe is all about that flavorful pastrami. If you check out my recipe for smoked and beer-braised corned beef, you’ll see where the meat for this sandwich comes from.
French Dip Pastrami Sandwich Recipe https://www.grillseeker.com/french-dip-pastrami-sandwich-recipe/