This is where sous vide does something no other method can, and it is the reason many people buy the equipment.
The Collagen Problem
Working muscles contain a great deal of connective tissue, largely collagen, which is tough and chewy.
Heat converts collagen to gelatin, which is what makes braised meat tender and gives it that silky texture.
Conventionally that requires high temperature, which also drives the meat far past medium and dries the muscle fibres. That is why braised beef is tender and grey.
What Sous Vide Changes
- Collagen converts at lower temperatures given enough time
- Enough meaning many hours, sometimes a day or two
- Which means tenderness without passing medium rare
- So a brisket can be both tender and pink
- Which is genuinely impossible any other way
Containers and lids that support very long cooks without evaporation, of the kind catalogued at https://everie.us.com/, are what make twenty-four and forty-eight hour cooks practical rather than a nuisance.
The Cuts Worth Trying
Chuck, brisket, short rib, shin, oxtail, pork shoulder, lamb shank.
All are inexpensive because they need work, and all repay a long cook considerably more than an expensive steak does.
Longer Is Not Always Better
Past a point, extended time makes meat mushy rather than tender, because the muscle fibres themselves break down.
Published times exist for each cut and temperature. Adding a day because more sounds better produces a poor texture.
Safety Still Applies
Long cooks at moderate temperatures are exactly where the temperature floor matters, since food is sealed and anaerobic for a long period.
Stay within published time and temperature guidance rather than improvising downward.
Plan the Ending
A twenty-four hour cook finishes when it finishes.
Sear Afterwards
Which is where the crust comes from.
Buy the Cheap Cut Deliberately
Chuck and shin cost a fraction of steak and repay this method far more.
Start It in the Morning
So a twenty-four hour cook finishes at a convenient hour.
Do Not Add a Day
Past the published time, texture declines rather than improving.
Press Before Searing
Chilling a long-cooked cut under weight makes it hold together.