The most amazing part of French dip is that it can be reheated a lot of times and still will have its delicious taste.
In a crockpot:
Сook for 1-2 hours and don’t forget to add some “au jus” to your beef
In a stove:
Add some ‘au jus’ to your beef and bake in the preheated oven on medium heat for 5 minutes, or until the cheese just begins to melt.
In a microwave:
Add some ‘au jus’ to your beef and put your sandwiches in a microwave-safe dish and cover with a microwave-safe lid. Microwave for 60 seconds, if needed continue to microwave for 30 seconds.