cooking / mains

Sous Vide Roast Beef

serves 8-10 · 6-8 hours plus overnight chill · 15 minutes hands on · medium

Why This Works

Sous vide cooks the roast evenly edge to edge — no gray band of overcooked meat — and searing first plus an ice bath after locks in a crust and a texture that slices cleanly. It's a make-ahead protein: cook it days before you need it.

Ingredients

  • 1.5-2 lb top sirloin roast
  • Kosher salt, generous
  • Black pepper, generous
  • 1 tsp garlic powder
  • 2-3 sprigs fresh thyme or rosemary
  • Neutral oil, for searing

Method

  1. Sear the roast. Season generously with salt, pepper, and garlic powder. Heat a cast iron skillet over high heat until smoking and sear the roast on all sides until deeply browned, 2-3 minutes per side — you want a dark crust everywhere. Cool 5-10 minutes.
  2. Sous vide. Place the roast in a vacuum bag with the fresh herbs and seal (vacuum sealer or water displacement). Cook at 129-131°F for 6-8 hours; longer means more tender. 129°F gives rare, 131°F medium-rare (recommended), 135°F medium.
  3. Ice bath and chill. Remove the bag and immediately submerge in an ice bath for 10-15 minutes to stop the cooking and set the texture. Refrigerate overnight in the bag. Save all the bag juices — they're liquid gold for au jus.
  4. Slice and serve. Remove from the bag (juices reserved) and slice: thick for sandwiches, thin center slices for a roast dinner. Serve cold or at room temperature.

Notes

  • Cold meat slices far cleaner than warm; use a sharp knife and cut against the grain.
  • The ice bath is essential — skipping it lets carryover cooking creep in.
  • Refrigerate the bag juices; the fat solidifies on top, and both fat and gelatinous juices go into au jus.
  • Keeps 4-5 days refrigerated. Excellent with horseradish crème fraîche on sandwiches, or thin-sliced with Yorkshire puddings.