Ordinary recipes come out pale and watery in the slow cooker — what has to change when you adapt one?

The pale part is a separate problem from the watery part, and it has a separate fix: brown things first.

A slow cooker cannot brown anything. It never gets hot enough at the surface, and everything is sitting in moisture, so no browning reaction happens at all. Every recipe written for a pan starts by browning meat and softening onions, and that step is producing a large share of the colour and the savoury depth. Skip it and you get exactly what you describe — pale, and tasting like the parts.

So: brown the meat properly in a pan, cook the onions until they actually take some colour, and deglaze the pan with a bit of your liquid so nothing is left behind. Then everything goes in the cooker.

It is ten minutes and a second pan to wash, and it is the difference between the two versions.

Two related things worth doing while the pan is hot:

Bloom the spices and cook the tomato paste. Both change character with heat and both stay raw-tasting in a slow cooker. Thirty seconds in the pan.

Reduce any wine or stock in the pan rather than pouring it in cold. This handles part of the liquid problem at the same time.

If you take one thing: the machine is very good at the long tender part and cannot do the two ends. Do the beginning in a pan and the end with the lid off.

There is a set of rules and it comes from one fact: a sealed slow cooker loses almost no liquid, and it also draws liquid out of everything in it.

On a hob or in an open oven dish, a large amount of water leaves during cooking. That is not a side effect — it is how a sauce becomes concentrated and how flavours become one thing rather than several. In a slow cooker none of it leaves, and the meat and vegetables add more.

So the conversions, in order of how much they matter:

Cut the liquid hard. Not a little — typically to somewhere between a third and a half of what the recipe says, sometimes less. For something like a stew with plenty of vegetables you often need almost no added liquid at all. This is the biggest single change and reducing it a bit is why you saw only a bit of improvement.

Fix the sauce at the end, with the lid off. Take the lid off for the last half hour on high, or lift the solids out and reduce the sauce in a pan for five minutes. This is the step that gets you from cooked ingredients to a dish, and it is the one most people skip.

Season at the end as well as the start. Long cooking flattens aromatics and dulls acidity. A squeeze of something sharp and a fresh grind of pepper at the end restores most of what you think is missing.

The other rule that fixed most of my flat results: not everything goes in at the start.

A recipe written for ninety minutes has one timeline. Stretched to eight hours, ingredients that were meant to keep their character are destroyed. What suffers:

Dairy. Cream, milk and yoghurt separate over long cooking. Add at the end, off the heat if possible.

Anything green or delicate. Peas, spinach, courgette, fresh herbs. These want the last few minutes, not the first eight hours.

Seafood. Minutes, not hours.

Pasta and rice. Cook separately unless the recipe is written for it, or you get a starchy mush that also thickens the sauce in a way you did not choose.

Fresh herbs, citrus zest, garlic you want to taste. All flatten out completely. Dried herbs at the start, fresh at the end.

What genuinely benefits from the full time is the tough cut, the root vegetables, the dried beans and the pulses. That is what the machine is for.

So the honest answer to your last question: most dishes do translate, but the conversion is not one adjustment — it is less liquid, brown first, hold back the delicate things, and finish with the lid off. Do all four and the gap between the two versions mostly disappears.