A perfectly pan-fried fish fillet with crisp, golden skin and a tender interior is one of the most underrated pleasures in cooking. It is also one of the things home cooks most often get wrong. The fish sticks to the pan. The skin tears. The flesh dries out. None of these are accidents — they are predictable outcomes of small technique errors, and they are fixable.

Dry the fish thoroughly

This is the single most important step and the one most often skipped. Moisture on the skin is what causes the fish to stick and steam instead of brown. Pat both sides dry with kitchen paper. If you have time, let the fish sit on a rack in the fridge uncovered for 30 minutes — even better.

Season the skin generously

Salt the skin just before cooking — not too far ahead, or the salt draws out moisture and undoes step one. Generous flakes give better adhesion than fine salt.

Score the skin

For fish with thick skin (sea bass, sea bream, salmon), shallow diagonal cuts every 2cm through the skin (but not into the flesh) stop the skin curling away from the pan as it cooks.

Heat the pan properly

The pan must be hot before the fish goes in. A drop of water flicked onto the surface should evaporate within a second. Then add the oil and let it shimmer. Cold pan plus fish equals stuck fish — every time.

Use the right pan

For crispy skin, stainless steel or carbon steel give the best result. Non-stick works but does not produce the same depth of crust. If you are nervous about sticking, well-seasoned cast iron is a forgiving middle ground.

Press the fillet down

Fish skin tightens as it heats, causing the fillet to curl up away from the pan. The first 20-30 seconds, use a fish slice or spatula to press the fillet flat against the pan. After that, leave it alone.

Do not move it

This is the second most important rule. Once the fish is in the pan, do not touch it. Do not poke it, do not lift it to check. Stuck fish is fish that has not finished cooking on the underside. When it is ready to flip, it will release from the pan naturally. Most fillets take 3-4 minutes skin-side down — about 80% of the total cooking time.

The flip and the finish

Once the skin is crisp and the flesh has turned opaque most of the way up the side, flip it once and cook for 1-2 minutes on the flesh side. That is it. Over-cooking is far more common than under-cooking.

Add butter at the end

For extra flavour, drop a knob of butter in once you have flipped the fish, along with thyme or sage. Tilt the pan and spoon the foaming butter over the fillet. This is called arroser and gives a glossy, herby finish.

Rest briefly

Even fish benefits from a short rest before serving. A minute or two on a plate is enough.

Some good fish to start with

Sea bass, sea bream, mackerel, salmon and trout all have skin that crisps beautifully and are easy to source. Once you have the technique down, try Dover sole, turbot or red mullet for an upgrade.

Practice makes perfect

Pan-fried fish is one of those skills that gets dramatically easier with practice. The first time you might tear a fillet; the fifth time you will produce restaurant-quality fish in 6 minutes. It is worth the practice.