Do not remove the leaves from the rosemary branches.
Put the beef, rosemary, garlic, and wine into a vacuum sealing bag and remove as much air as possible.
Seal the bag.
Attach the sous vide cooker in a large pot or another container. Fill it with water somewhere between the minimum and maximum fill lines.
Add the sealed bag and make sure it isn't rising to the surface. You can secure it with a clip if you wish.
Set the immersion cooker to the desired time and doneness.
When the roast is done, remove the bag from the pot and set it aside. I like to put mine in the refrigerator to rest while I finish cooking side dishes.
Heat a large cast-iron skillet or grill until it is almost smoking. Put a little oil in and spread it around.
Cut the bag open and remove the rosemary sprigs and roast of beef. Discard the garlic and wine.
Put the rosemary on the grill and quickly put the roast on top. Brown it on one side, then turn it and the rosemary on the other side.
Let the roast rest about 5 minutes before carving it. Enjoy!
Notes
You can use a larger or smaller piece of beef if you want, it's up to how many people you need to serve. I usually allow a third of a pound per person.
Scan for full nutrition info and step-by-step photos.