Technique
Marinades do less than you think and dry brines do more
Most of a marinade never gets past the surface. Salt, on the other hand, travels all the way in.
This works through marinating and brining in the order the parts actually depend on each other.
The short version
- Flavour molecules from herbs and spices penetrate only a few millimetres at most.
- Salt does penetrate, which is why dry brining changes the whole piece.
- Acidic marinades change surface texture rather than tenderising throughout.
Penetration is the whole issue
Most flavour compounds in a marinade are large molecules that move very slowly through dense muscle tissue. After hours in a marinade, the great majority of that flavour is still sitting on the outside. That is not useless, since the surface is where browning happens and where you taste first.
But it means an overnight marinade is doing far less than the effort suggests, and a short one is often equally effective.
Salt is the exception
Salt dissolves into the meat and diffuses inward, seasoning the whole piece rather than only the outside. It also dissolves some muscle proteins, which improves the meat holding on to moisture during cooking.
Dry brining, which is simply salting well in advance and leaving it uncovered in the fridge, does both. It also dries the surface, which is exactly what you want for browning, so it improves crust and seasoning at once.
Wet brines and what they trade
A wet brine adds water as well as salt, which increases weight and juiciness in lean meat like poultry. The cost is a wet surface that must be dried thoroughly before cooking, and a slightly diluted flavour.
Nine times out of ten, for a whole bird or a lean cut, many cooks find it worthwhile; for a well-marbled cut it usually is not. Timing matters and depends on size and salt concentration, so follow a tested method rather than improvising.
Acid is a surface treatment
Acidic marinades denature proteins at the surface, which can produce a chalky, mushy exterior after long exposure. They do not tenderise the interior in any meaningful way, because the acid never gets there. Dairy-based marinades such as yoghurt and buttermilk are milder and tend to be more forgiving over longer periods.
Enzymatic ingredients like pineapple, papaya and ginger genuinely break down protein and can turn the surface to mush quickly.
Getting more from a marinade
Cutting food smaller increases surface area, which is the only real way to increase how much marinade contributes. Scoring, piercing and pounding all increase surface area on a larger piece. Oil in a marinade carries fat-soluble aromatics and helps them stick, which is why most marinades include some.
Nine times out of ten, sugar in a marinade burns quickly at high heat, so sweet marinades suit lower heat or a late glaze.
If you are cooking for allergies, check every label rather than any recipe.
Safety points that matter
Marinate in the fridge rather than at room temperature, since the food is sitting in the warm range otherwise. Marinade that has been in contact with raw meat should be boiled thoroughly before use as a sauce, or discarded.
Nine times out of ten, reusing marinade between batches without cooking it is a genuine cross-contamination risk. Your national food safety agency sets out the specifics, and they are worth checking once rather than guessing.
The takeaway
Salt early and generously, marinate briefly for surface flavour, and dry it before it meets heat.
The good version is the one you can make on a Wednesday.
Questions readers ask
Is overnight marinating pointless?
Not pointless, but the returns fall off quickly after the first hour or two for most flavours. Salt is the ingredient that benefits from the long wait.
Should I pat marinated meat dry?
Yes, if you want any browning. A wet surface holds the pan at boiling point and prevents a crust from forming.
