Burnt Outside, Raw Inside

The sausage that looks perfect on the outside but runs pink in the middle. The chicken thigh with scorched skin and flesh that's cold against the bone. The thick pork chop that's mahogany on both sides and raw through the centre. You've seen these failures. Most cooks have produced them.

The cause is always the same: the outside is being cooked by a different mechanism than the inside, and those two mechanisms are running at incompatible speeds. Understanding that mismatch - and knowing how to correct it - is one of the most transferable skills in all of cooking.

Food burns outside and stays raw inside when the cooking temperature is too high relative to the thickness of the food. The exterior - exposed directly to the heat source - cooks and chars rapidly. The interior relies on heat conducting slowly inward through the food, which takes much more time. When the outside exceeds its safe temperature before the heat has had time to travel to the centre, you get the classic failure: charred exterior, raw core.

The fix is always some version of the same principle: slow down the outside, speed up the inside, or both. The specific technique depends on what you're cooking.

Two Types of Heat Doing Different Jobs

Surface Heat: Fast and Aggressive

The outside of food is cooked by conduction (direct contact with a hot pan), convection (hot air or liquid surrounding the food), or radiation (direct heat from a flame or element). All of these mechanisms transfer heat to the food's surface quickly and efficiently - particularly conduction, where a cast iron pan at 200°C transfers enormous energy to the millimetres of food touching it.

Interior Heat: Slow and Dependent

The interior of food receives no direct heat from the cooking source at all. It is heated entirely by thermal conduction within the food itself - the slow transfer of energy from the hot exterior, molecule by molecule, inward toward the centre. For most proteins and vegetables, this process is governed by very low thermal conductivity. Heat moves through a chicken breast roughly 200 times more slowly than it moves through a copper pan.

This means that while the exterior of a thick piece of food can reach 200°C in minutes, the interior might still be at 40°C. The gap between these two temperatures - and the time it takes to close that gap - is where the burning happens.

Thermal Conductivity: The Scale of the Problem

The gap between the conductivity of a hot pan and the food on it explains everything. The pan is ferociously efficient at delivering heat to the surface. The food is ferociously inefficient at moving that heat inward. Cooking is the art of managing that gap.

"The outside doesn't know the inside exists. It just responds to the heat it's touching. Managing the gap between them is what cooking actually is."

What Most People Get Wrong

The Four Solutions: Matching the Method to the Problem

Approach 1 - Lower the Heat The simplest fix for most pan cooking. Reducing temperature slows the rate the exterior burns, giving interior conduction time to catch up. Critical for thick sausages, bone-in chicken, stuffed peppers, and anything with a dense or insulating interior. Medium heat over more time consistently beats high heat over less time for thick foods.

Approach 2 - Sear Then Finish in the Oven The professional two-stage method. Sear the exterior over high heat to develop colour and crust, then transfer to a moderate oven (160-180°C / 320-350°F) to finish cooking through. The oven uses ambient convection heat to warm the interior gently from all sides simultaneously. Works for thick steaks, chicken portions, pork chops, fish, and large meatballs.

Approach 3 - Start Low, Finish High (Reverse Sear) The inverse of the sear-then-oven method. Cook gently in a low oven first - 120°C / 250°F - until the interior is nearly at target temperature, then apply high heat for a fast sear. Because the interior is already almost cooked, the exterior can brown quickly without any risk of a raw centre. Produces the most even cook-through of any method.

Approach 4 - Use a Liquid Medium Braising, poaching, or simmering cooks food in liquid at a maximum of 100°C / 212°F. This temperature ceiling means the exterior can never char. The liquid also conducts heat more effectively than air, warming the interior faster than dry heat. For sausages especially: simmer in water first until cooked through, then briefly sear for colour.

Practical Cooking Tips: Food by Food

Thick steaks and pork chops

The reverse sear is best for any cut over 3cm thick. Season and place on a rack in a low oven at 120°C / 250°F until the internal temperature reads 10°C below your target. Remove, rest 5 minutes, then sear in a screaming-hot pan with butter for 60–90 seconds per side. The exterior browns perfectly because the interior is already warm - there is no thermal gradient to overcome.

Sausages

Start in a cold pan with a small amount of water. As the pan heats, the water simmers and gently poaches the sausage through before evaporating entirely. Once the water is gone, the residual fat finishes the browning. No burning, no raw centres, no splitting casings.

Bone-in chicken pieces

Bone conducts heat even more poorly than muscle tissue. The technique: sear skin-side down in an oven-safe pan until deep golden, flip briefly, then transfer to a 200°C / 400°F oven for 20–25 minutes. The ambient oven heat reaches all surfaces simultaneously - including around the bone - in a way a pan never can.

The One Tool That Solves This Permanently A meat thermometer eliminates all guesswork. For chicken: 74°C / 165°F at the thickest point. Pork: 63°C / 145°F. Medium-rare steak: 55°C / 130°F. Instant-read thermometers cost very little and remove the anxiety from every piece of meat you'll ever cook.

Bread and cakes

The burnt-outside-raw-inside failure in baking is almost always an oven temperature problem. Home ovens frequently run 15-25°C hotter than their dial indicates. An oven thermometer reveals this immediately. If the exterior is browning too fast, tent the top loosely with aluminium foil after the first 20 minutes - this blocks direct radiant heat from above without affecting the oven's ambient temperature.

Root vegetables and dumplings

Start covered in a roasting tin with a splash of water or stock for the first 20 minutes (steaming the interior), then remove the cover and increase heat for the last 15 minutes to caramelise the surface. Steam first, roast second.

Troubleshooting: Diagnosing Your Specific Failure

The Two-Zone Cooking Principle

Every professional kitchen operates on an understanding so fundamental it's rarely stated explicitly: most food benefits from being cooked in two zones - a high-heat zone for surface development, and a lower-heat zone for cooking through. The pan provides the first. The oven provides the second.

The sear-then-oven technique isn't a workaround for tricky cuts. It's the correct cooking method for almost anything with significant thickness. A thick chop cooked in a pan over high heat from start to finish is being cooked incorrectly by design. The pan was never meant to do both jobs at once.

The practical implication: think of your pan and your oven as a team, not alternatives. The pan does what the oven cannot - rapid, high-contact surface browning through the Maillard reaction. The oven does what the pan cannot - gentle, even, all-surface heat penetration that warms the interior without burning the exterior. Use both, in sequence, and the burnt-outside-raw-inside problem becomes structurally impossible.

Burnt outside, raw inside is the predictable outcome of asking one heat source to do two incompatible jobs simultaneously - rapid surface browning and slow interior cooking through - without giving it the conditions to succeed at both.

The fix is always a version of the same principle: separate the two jobs. Let high heat do the exterior work quickly. Let gentle, patient heat - oven, liquid, or lower pan temperature - do the interior work slowly. Use a thermometer to confirm when the interior is done rather than inferring from the exterior's colour.

Master this principle and it applies to every thick piece of food you will ever cook, in any kitchen, for the rest of your life.

So, What Really Matters?

• Food burns outside and stays raw inside because exterior heat (conduction from a pan, radiation from a grill) is much faster than heat conduction through the food itself.
• Meat conducts heat roughly 200 times more slowly than metal - meaning the pan can be scorching while the food's centre barely warms.
• The fix is always separating the two stages: high heat for the exterior, gentle heat for the interior.
• The sear-then-oven method is the most practical professional solution for thick proteins - sear in a hot pan, finish in a moderate oven.
• The reverse sear (low oven first, high-heat sear at the end) produces the most even results for thick steaks and chops.
• For sausages: start in a cold pan with water. Simmer through first, then brown once the water evaporates.
• A meat thermometer eliminates all guesswork permanently - it's the single most effective tool for solving this problem across every food.
• Home ovens frequently run hotter than their dial indicates - an oven thermometer reveals this and solves burnt-outside baking problems immediately.