How to Reheat Roast Beef
Leftover roast beef, sliced or whole pieces.
The Short Answer
The best way to reheat roast beef is in the oven with au jus. Low oven at 250 degrees F with au jus or beef broth, covered with foil for 15-20 minutes. Same approach as prime rib.
Reheating Methods
🔥 Oven
Temperature: 250°F
Time: 15–20 minutes
Place slices in baking dish with a few tablespoons of au jus or broth. Cover with foil. Heat until warmed through, not hot.
🍳 Stovetop
Time: 2–4 minutes
Warm au jus or broth in a skillet. Add beef slices, spoon liquid over. Heat just until warm.
Do not use high heat. Roast beef goes from medium-rare to well-done very quickly. Gentle warming is the goal.
Sliced roast beef sandwiches are actually best with the meat warmed in au jus or gravy. Heat the liquid, dip or spoon it over the slices, and serve on good bread. A French dip approach to leftovers.
Frequently Asked Questions
Yes. Cold roast beef is a classic sandwich meat. Slice thin and serve on bread with horseradish sauce or mustard. No reheating required.
The Bottom Line
The best way to reheat roast beef is in the oven with au jus. The key to great reheated food is low-and-slow heat, moisture retention, and patience. Rushing with high heat dries food out and creates uneven hot and cold spots. When in doubt, go lower and slower.
Source: Culinary reference | Last verified: March 26, 2026 | Our methodology