Leftover Beef Miroton

The French figured this out centuries ago: leftover roast beef doesn’t have to be sad. Miroton is the bistro answer to “what do I do with last night’s meat." Browned onions, a splash of vinegar, bouillon, and a quick roux come together into a tangy, savory sauce that gives cold beef a second life.

The vinegar is what makes this dish. It cuts through the richness of the beef and onions with a sharp acidity that keeps every bite interesting. The browned flour thickens the sauce into something that clings to the meat without being heavy.

A shower of bread crumbs on top goes into a hot oven for just 10 minutes. They crisp into a golden crust that contrasts with the saucy meat underneath.

Pro Tips

• Brown the onions properly. They should be deeply golden, not just translucent. This is where most of the flavor comes from.
• Don’t cook the beef in the sauce for too long. It’s already cooked. You’re just warming it through and letting it absorb the sauce. Overcooking makes it tough and dry.
• Use good vinegar. Red wine vinegar is traditional and adds the right bite.
• Slice the beef thin for better sauce absorption. Thick cubes stay dry in the center.

Variations

• Add a tablespoon of tomato paste with the bouillon for a richer, more robust sauce.
• Top with grated Gruyère instead of bread crumbs for a gratineed version.
• Use leftover roast pork or lamb instead of beef. The sauce works with any roasted meat.