Ingredients
Method
- Barely simmer broth in a wide skillet. Add roast beef for 2 minutes until hot but not curled.
- Melt butter in a saucepan. Whisk in evaporated milk and cornstarch; simmer 1 minute.
- Remove from heat; stir in cheddar by handfuls until sauce flows smoothly.
- Mix ketchup and vinegar in a small bowl; spread thinly on toasted cut rolls.
- Drain warm beef well; divide among 4 rolls. Spoon over cheese sauce; close.