Steeping food in a seasoned liquid before cooking — which flavours the surface, and does far less to the interior than most recipes imply.
Technique at a glance
A compact visual model of the lesson. Use the full mechanism and success criteria below when you practice.
Concept
Steeping food in a seasoned liquid before cooking — which flavours the surface, and does far less to the interior than most recipes imply.
What changes
The claim that a marinade penetrates deeply is mostly wrong.
What good looks like
The surface should still look raw. Opacity or a whitened edge means the acid has begun cooking it.
Practice counts when you cook
Reading this brief does not change your School state. Finish a real practice dish in Cook mode and log the cook; that cook is the evidence that advances the skill.
What to focus on
Mechanism
The claim that a marinade penetrates deeply is mostly wrong. Flavour molecules are large and diffuse slowly through dense muscle; after several hours most have travelled only a few millimetres. Salt is the exception — it is small and ionic and does move inward, which is why the genuinely effective part of most marinades is the salt, and why a dry brine achieves much of the same result. Acid does something else entirely and is the part that goes wrong: citric or acetic acid denatures surface proteins in the same way heat does, so past a few hours the outer layer turns opaque, mealy and chalky, cooked without ever meeting a pan. Ceviche is that effect used deliberately. Enzymes in pineapple, papaya and ginger are more aggressive still and turn meat to mush within hours. Oil carries fat-soluble aromatics and helps them cling; sugar helps browning but burns.
Success criteria
The surface should still look raw. Opacity or a whitened edge means the acid has begun cooking it.
Two to four hours is the working window for most acidic marinades; overnight belongs to salt-forward, low-acid ones.
The meat is wiped nearly dry before cooking — a wet surface steams instead of searing.
Non-reactive containers only. Aluminium reacts with acid and adds a metallic taste.
Failure guards
The outside is mealy and chalky after cooking.
Too long in acid. The surface proteins denatured before any heat arrived, and they will never take a proper crust.
The meat turned to mush.
Enzymatic marinade — pineapple, papaya, kiwi or ginger. These act fast and do not stop.
Burnt black patches and a bitter taste.
Sugar in the marinade, not wiped off. Sugars carbonise well below searing temperature.