The Order You Put Things in the Pan Is Most of the Recipe, and It Follows One Rule

Almost every savory dish that starts in a pan follows the same sequence, and once you can see the sequence you stop needing the recipe to tell you it. The sequence is not arbitrary and it is not tradition. It is a single principle applied nine times.
Everything goes in ordered by how much heat it can take and how volatile its aroma is. Durable and slow first. Fragile and fleeting last. That is the whole rule, and every step below is a consequence of it.
Fat first, and hot before anything joins it
The fat is the heat-transfer medium. It touches every irregularity of a surface that hot air would only touch in patches, which is why a thing fried in fat browns evenly and a thing in a dry pan browns in spots.
Get it hot before anything goes in. Adding food to cool fat means the food and the fat come up to temperature together, which means the food spends several minutes releasing water into a pan that is not hot enough to evaporate it, and by the time the pan is ready the food is already steaming.
Hard aromatics next, and they need much longer than you think
Onion, carrot, celery, leek, fennel. These are dense, wet, and full of sugars and amino acids that need time and heat to do anything interesting.
They also release a lot of water, which is why they go in early: the pan has to get that water out before anything else can brown. An onion that has gone soft and translucent has released its water. An onion that has gone gold has started browning. An onion that has gone deep and jammy has been in the pan for thirty or forty minutes, not the eight that recipes claim.
Garlic and ginger go in far later than the onion, and that is not squeamishness
Garlic is small, thin and comparatively high in sugar, so it reaches browning temperature almost immediately and goes past it to burnt within a minute. Onion is dense and wet and takes twenty times as long to get to the same place.
Putting them in together means either raw onion or burnt garlic, and burnt garlic is not a mild flaw. It produces an acrid bitterness that does not cook out and that you will taste in the finished dish two hours later.
Thirty seconds to a minute before the liquid goes in. That is the window, and it is short enough that it should be measured rather than estimated.
Ground spices bloom in the fat, and this is the step recipes leave out
Most of what a ground spice smells like is oil-soluble. That is a chemical fact with an enormous practical consequence: shaking cumin over a finished dish does almost nothing, because there is no fat in contact with it and nothing to carry it.
Thirty to sixty seconds in the hot fat, off to the side of the aromatics or stirred through them, and the spice releases into the oil, which then distributes it through everything the oil touches. The smell changes noticeably in the room when it works.
Past about a minute they burn, and ground spices burn faster than whole ones because of the surface area. If the pan is very hot, take it off the heat, add the spices, and let the residual heat do it.
Tomato paste belongs in the same slot and wants a little longer, one to two minutes, until it darkens from red toward brick. That color change is browning happening on the paste itself, and skipping it leaves a raw metallic note in the finished dish.
The liquid is the line that divides the recipe in two
The moment liquid goes in, the pan drops to the boiling point and stays there, and nothing browns again for the rest of the cooking. Everything before that moment was browning. Everything after it is extraction.
Which means every browning decision has to have been made already. If the onions are not where you want them, adding stock does not fix it later, it fixes it never.
Hardy herbs go in with the liquid. Thyme, rosemary, bay, oregano. Their aromatic compounds are relatively heavy and relatively stable, and they need time and moisture to come out, which is exactly what the next hour is.
Acid has two slots and soft herbs have one
Vinegar goes in early. It is volatile, so it mellows and rounds as things cook, and a vinegar added at the end tastes like vinegar rather than like depth.
Citrus goes in at the end, off the heat. Citric acid is not volatile and citrus aroma is, so cooking it costs you the smell and keeps all the sourness, which is the worst of both.
Soft herbs go in last, off the heat, always. Parsley, basil, cilantro, dill, chives, tarragon. Their aroma lives in compounds that leave at the first opportunity, and putting basil into a simmering sauce is a decision to have cooked basil, which is a different and lesser ingredient.
And a finishing fat goes in after that, off the heat entirely. A knob of butter or a good olive oil at the end is not a richness decision so much as an aroma decision: fat carries volatile compounds, so a raw finishing fat delivers its own smell and lifts everything already in the pan.
The nine steps, which are one idea
Fat, hard aromatics, garlic, spices, tomato paste, liquid and hardy herbs, long cooking, acid, soft herbs and finishing fat.
Every position in that list is decided by two questions: how long does this need at heat, and how fast does its smell leave. Answer those about any ingredient you are holding and you will know where it goes without being told, which is the entire difference between following a recipe and cooking.
Part of Kitchen Systems.
Where this goes next