How to Cook Fish: Pan-Frying, Oven-Baking and Papillote

Overcooked fish turns dry and crumbly in seconds—few ingredients are less forgiving. While a cut of beef might tolerate an extra minute, a cod fillet or salmon portion leaves little room for error. Yet once you know what to look for, fish is one of the simplest ingredients to cook well.

Here are the three methods I teach my students—pan-frying, oven-baking and papillote—and how to cook fish using the right approach for your chosen fish and the result you want.

Why fish is so easy to overcook

Three things make cooking fish seem trickier than cooking meat:

1. The window for getting it right is very short. Just two minutes can take the flesh from pearly to dry.
2. The flesh is delicate. It tears, sticks or falls apart if you move it too soon.
3. We watch the clock rather than the fish. Cooking fish is about sight and touch, not simply counting minutes.

Get these three things right, and fish becomes one of the quickest and most rewarding things you can cook.

Method 1 — Pan-frying: for crispy skin

This is the best method for skin-on fillets—salmon, sea bass, sea bream or cod.

Here is the technique, step by step:

• Pat the skin dry with kitchen paper—moisture is the number one enemy of crispy skin
• Add a neutral oil to a hot pan, then place the fish skin-side down
• Press gently on the fillet for the first ten seconds to stop it curling up
• Leave it alone for 80% of the cooking time—the skin needs to cook undisturbed
• Turn it just once, then take the pan off the heat and let the flesh side cook briefly in the residual heat

Allow roughly four minutes on the skin side for a 2 cm-thick fillet, then one minute on the flesh side. The fish is ready when the flesh turns opaque around the edges but remains slightly translucent in the centre—it will finish cooking off the heat.

Method 2 — Oven-baking: for even cooking with less attention

The oven is ideal for thicker portions or whole fish, and offers a little more room for error than a frying pan.

• Preheat a fan oven to 180 °C (356 °F)
• Lightly oil the fish and season just before putting it in the oven
• Allow roughly 10 minutes per 2 cm of thickness, adjusting for the size of the piece
• Remove it as soon as the flesh separates easily with the tip of a knife, rather than waiting for it to crumble

Chef's tip — Thick white fish, such as cod or pollock, can tolerate slightly longer cooking than oily fish such as salmon, which dries out faster in the oven.

Method 3 — Papillote: for beautifully tender fish

Fish cooked en papillote steams in its own juices. It is the most forgiving method, making it ideal for lean fish that dries out easily.

• Place the fish on a sheet of baking parchment with finely sliced vegetables, a drizzle of oil, herbs and a little liquid, such as light stock or lemon juice
• Fold the edges over to seal the parcel tightly—the steam must stay inside
• Bake at 200 °C (392 °F) for about 15 minutes for a medium-sized fillet
• Open the papillote at the table: the escaping steam is part of the experience

Papillote will not brown the flesh—if you want a crust, choose the frying pan instead.

The signs to look for

• Touch. Cooked flesh offers a little resistance when pressed gently and springs back; raw flesh feels soft and gives way under your finger.
• Colour. The flesh changes from translucent to opaque—watch the centre of the fillet, which is the last part to cook.
• Flakes. Cooked flesh separates into distinct flakes without resistance when tested with the tip of a knife.
• Juices. If white, milky juices appear on the surface, the fish is already overcooked—aim to take it off the heat before this happens, rather than waiting for the signal.

The mistake to avoid

Never take fish straight from the fridge and put it directly on the heat. A very cold centre means the outside has to cook for longer while the heat reaches the middle—the opposite of what you want. Leave it at room temperature for fifteen minutes before cooking.

Conclusion

Use the pan for a crisp crust, the oven for even cooking and papillote for maximum tenderness. Three methods, three results, with one shared principle: watch the flesh, not the clock. These are the same cues my students use from their first cooking modules at OuiChef Academy, until cooking fish just right becomes second nature rather than a gamble.

Frequently asked questions

How can you tell if fish is cooked without a thermometer?

Look at the flesh: it should be opaque all the way through and separate easily into flakes with the tip of a knife, without being dry or crumbly.

What is the best way to cook oily fish such as salmon?

Pan-frying makes the most of the fat beneath the skin and gives you a crisp crust. Choose papillote if you prefer softer, more tender flesh without browning.

Why does my fish always stick to the pan?

Usually because the pan is not hot enough when you add the fish, or because the skin was not dried thoroughly before cooking.