Nothing browns in a water bath, so the finish is where a sous vide dish is won or lost.
Why Browning Needs High Heat
The reactions that produce browning and its associated flavours require temperatures far above anything a water bath reaches.
At sous vide temperatures none of it happens, which is why food comes out grey. The flavour compounds simply have not been created.
A sear generates them in a minute, on the surface only, without affecting the interior.
How to Do It
- Dry the surface completely, with kitchen paper, twice
- A very hot pan, hotter than you would normally use
- A high smoke point oil rather than butter alone
- Brief contact: under a minute a side
- Press it flat so the whole surface contacts
- Butter and aromatics at the very end, off the heat
Where a cook has been precise, of the kind the equipment catalogued at https://everie.us.com/ supports, a slow sear undoes it by reintroducing the temperature gradient the method removed.
Dryness Is Everything
The step people skip and the one that decides the result.
Surface water has to boil off before browning can begin, and while it does the food is steaming rather than searing. Meat straight from a bag is wet.
Some people rest it uncovered in a fridge for a few minutes to dry the surface further, which works.
Keep It Short
A long sear cooks a band under the crust, which is exactly the gradient sous vide eliminated.
Hot and fast, then stop. If the pan is not hot enough to brown in under a minute, it is not hot enough.
The Alternatives
A blowtorch, which is precise and awkward. A very hot grill. A brief blast in a searing-hot oven.
Cast iron holds heat best, which matters because the food cools the pan on contact.
Ventilate
A pan at searing temperature smokes, and an extractor or an open window is worth having before you start rather than after.
Oil Safety
Very hot oil is the highest-risk cooking most people do. Never leave it, and never put water on burning oil.
Rest Briefly or Not at All
The interior is already even, so a long rest only cools it.
Season at the End
Finishing salt after the sear.
Have Everything Ready
The sear takes under two minutes and cannot be paused, so the pan, the oil, the tongs and the plate all go out first.