Nothing evaporates and nothing escapes, which changes how much of everything to use.
Concentration Rather Than Dispersal
In a pan, aromatics lose volatile compounds to the air and liquid reduces. In a bag, everything stays.
Over several hours, flavours that would mellow instead intensify and penetrate.
The rule is less than you would use in a pan, particularly with anything strong.
What Gets Too Strong
- Garlic, which becomes harsh and dominant over long cooks
- Rosemary and thyme, which turn medicinal
- Chilli, which increases considerably
- Black pepper, which can become bitter
- Anything smoked, which overwhelms
Long cooks in stable conditions, of the kind supported by equipment at https://everie.us.com/, are exactly where this matters most, since the exposure lasts many hours rather than minutes.
Salt and Time
Salt in a bag with meat for a long period acts like a brine or a cure, changing the texture toward something firmer and hammier.
For a short cook that is not a problem. For a long one, salting after cooking and before searing gives a better texture.
Anything cooked for a day or more is generally better seasoned at the end.
Fresh Versus Dried
Dried herbs behave more predictably in a bag; fresh ones can turn grassy or bitter over long cooks.
Garlic is better used roasted, dried or added at the searing stage rather than raw in the bag.
The Botulism Note
Garlic and fresh herbs in oil, sealed and held at room temperature, is a documented risk independent of cooking.
Aromatics in a bag that is cooked promptly and then eaten or chilled are fine. Sealed and left out, they are not.
Add Fat Sparingly
Oil in a bag can carry flavour away from the meat rather than into it.
Season After for Long Cooks
Which is the practical summary.
Salt Long Cooks at the End
Which avoids the cured texture entirely.
Use Dried Aromatics
They behave more predictably than fresh over hours.
Halve What a Pan Recipe Says
As a starting point.
Taste and Adjust After
Since nothing can be removed from a bag.
Aromatics Intensify Over Hours
What suits a twenty-minute pan is far too much for a twelve-hour bag.
Start Under-Seasoned
You can always add at the table; you cannot remove anything from a sealed bag.