How Long to Cook a Fillet Steak Medium Rare

Good steak comes from good farming, not just good timing. But once you’ve bought a beautiful piece of grass-fed fillet from a local producer, the question that matters is how long to cook a fillet steak medium rare without ruining what you’ve paid for. The answer depends on thickness, temperature, and the pan you’re using. Get those three things right and the rest is straightforward. If this interests you, how to cook a ribeye medium rare: the proper method goes into more detail.

Why This Matters

Fillet steak is the most expensive cut on the animal. It sits beneath the ribs, does very little work, and stays tender as a result. That tenderness is what you’re paying for. It’s also lean, which means it cooks faster than fattier cuts and has less room for error.

When you overcook fillet, you lose everything that made it worth buying in the first place. It goes from buttery to dry in under a minute. Medium rare is the sweet spot. The centre stays soft and warm, the outside gets colour and flavour, and the texture remains what fillet should be.

This matters more with locally reared beef. Animals raised on pasture, finished slowly, and hung properly develop flavour that industrially produced beef simply doesn’t have. You taste the difference. Cooking it well is about respecting what the farmer put into it. If this interests you, how long to cook burgers: the proper method goes into more detail.

Getting Started

Take the steak out of the fridge at least thirty minutes before cooking. An hour is better. Cold steak straight from the fridge cooks unevenly. The outside chars before the centre warms through, and you end up with a gradient you don’t want.

Pat it dry with kitchen paper. Moisture on the surface prevents a proper crust from forming. Salt it just before it goes in the pan, or an hour beforehand if you prefer. Anything in between draws out moisture without enough time for it to be reabsorbed.

Use a heavy-based frying pan. Cast iron or stainless steel both work. Non-stick pans don’t get hot enough to sear properly. You want the pan smoking before the steak goes in.

Thickness is Everything

A two-centimetre fillet steak needs roughly two to three minutes per side for medium rare. A three-centimetre steak needs closer to three to four minutes. That’s at high heat in a properly preheated pan. If your steak is thicker than four centimetres, consider finishing it in the oven after searing both sides.

The internal temperature you’re aiming for is 52 to 55 degrees Celsius. That’s medium rare. Below 50 and it’s rare. Above 57 and you’re into medium territory. A digital thermometer removes the guesswork.

Pan or Oven

For steaks up to three centimetres, pan alone works fine. Sear on high heat, flip once, and rest it afterwards. For thicker cuts, sear both sides for colour, then transfer the whole pan into an oven preheated to 180 degrees Celsius. Check the internal temperature after three or four minutes.

I’ve found this method more forgiving. The oven heats the steak gently from all sides, so you avoid the overcooked outer layer that sometimes happens when you try to cook a thick steak entirely in the pan.

Practical Considerations

Timing shifts depending on how you manage the heat. If your hob runs hot, reduce the time slightly. If it’s underpowered, you might need an extra thirty seconds per side. Gas hobs respond faster than electric, which means you can adjust more precisely as you go.

Don’t move the steak around in the pan. Put it down and leave it. Flipping constantly doesn’t help. One flip is enough. The Maillard reaction that creates flavour and colour needs sustained contact with the hot surface.

Let it rest for at least five minutes after cooking. The muscle fibres relax, the juices redistribute, and the internal temperature evens out. Cutting into it immediately sends all that moisture onto the board instead of staying in the meat.

Fat and Flavour

Fillet has almost no fat marbling compared to cuts like ribeye. That’s why it’s tender, but it’s also why it needs a bit of help. A knob of butter in the pan during the last minute, spooned over the steak as it melts, adds richness. Some people add garlic or thyme to the butter. Both work.

You can wrap the fillet in bacon or pancetta before cooking if you want more fat. This is less common in Britain than elsewhere, but it solves the leanness issue. Just be aware it changes the cooking time slightly because the bacon insulates the meat.

Carry-Over Cooking

The steak keeps cooking after you take it out of the pan. Internal temperature can rise by three to five degrees during resting. If you pull it at 55 degrees, it might reach 58 by the time you cut into it. That’s the difference between medium rare and medium.

Pull it a degree or two early if you want to be precise. This becomes more important with thicker steaks where there’s more residual heat in the outer layers.

Regional and Seasonal Variations

Grass-fed beef from farms in Scotland, Wales, or the West Country tends to be leaner than grain-finished beef. That affects cooking time marginally, but more importantly it affects flavour. The meat tastes of the land. Cooking it medium rare lets that come through.

In summer, cattle are out on pasture eating fresh grass. The fat is slightly softer, sometimes more yellow. In winter, they’re often on silage or hay, and the fat firms up. It’s a subtle difference, but it’s there if you’re paying attention.

Some traditional breeds like Hereford, Aberdeen Angus, or Dexter take longer to mature. The meat from these animals is often darker, with a deeper flavour. It doesn’t need to be cooked differently, but it rewards being cooked well. Medium rare shows off what slower-grown beef can taste like.

Farmers who hang beef for three or four weeks are becoming more common, especially at farm shops and farmers markets. Dry-aged beef loses moisture, so the flavour concentrates. It cooks marginally faster because there’s less water to evaporate. Keep an eye on it.

In Practice

Most home cooks undercook or overcook fillet because they guess instead of checking. A thermometer solves that. Insert it horizontally into the side of the steak, aiming for the thickest part. If it reads 52 degrees, take the steak out. If it reads 48, give it another thirty seconds.

Some people press the steak with their finger to judge doneness. Medium rare feels like the fleshy part of your palm below your thumb when you touch your thumb to your middle finger. It works, but it takes practice. A thermometer is more reliable.

If you’re cooking multiple steaks, don’t crowd the pan. Each steak needs space around it or the temperature drops and you end up steaming rather than searing. Cook them one or two at a time, keep the cooked ones warm under foil, and they’ll all rest while the last one finishes.

Bone-in cuts like ribeye behave differently because the bone conducts heat. Fillet is almost always boneless, which simplifies things. If you’re interested in how bone affects timing and temperature, the principles are similar to what applies when cooking bone-in ribeye properly. The bone slows down heat transfer, so you adjust accordingly.

Buying direct from producers means you can ask how long the beef was hung, what the animal was fed, and how thick to cut your steak. That conversation matters. A butcher at a farm shop will cut it to the thickness you want, and they’ll tell you if the meat is particularly lean or well-marbled. Use that information.

Frequently Asked Questions

How long do you cook a 2cm fillet steak for medium rare?

A two-centimetre fillet steak needs about two to three minutes per side in a hot pan to reach medium rare. The exact time depends on how hot your pan is and whether the steak was at room temperature before cooking. Use a thermometer to check the internal temperature if you want to be sure. You’re aiming for 52 to 55 degrees Celsius in the centre. Let it rest for five minutes after cooking.

Should you flip a fillet steak more than once?

One flip is usually enough. Flipping constantly interrupts the Maillard reaction, which is what creates the browned, flavourful crust. Put the steak in a very hot pan, leave it for the required time, flip it once, then finish the other side. Some chefs flip every thirty seconds to control temperature more precisely, but for home cooking, one flip keeps things simple and works well.

Can you cook fillet steak straight from the fridge?

You can, but it’s not ideal. Cold steak cooks unevenly. The outside chars before the centre warms up, and you lose control over doneness. Take it out of the fridge at least thirty minutes before cooking, ideally an hour. Room temperature steak cooks more evenly and gives you a better result. Pat it dry before it goes in the pan to help the crust form properly.

What temperature should medium rare fillet steak be?

Medium rare fillet steak should reach an internal temperature of 52 to 55 degrees Celsius. Below 50 degrees is rare, and above 57 starts to move into medium. A digital meat thermometer is the most reliable way to check. Insert it horizontally into the thickest part of the steak from the side. Remember the temperature will rise slightly during resting, so you can pull it a degree or two early if you prefer.

Why does my fillet steak go tough?

Fillet goes tough when it’s overcooked. It’s a very lean cut, so there’s little fat to keep it moist once the proteins tighten up past medium. If you cook it beyond 60 degrees, it dries out and the texture changes. Make sure you’re not cooking it too long. Use a thermometer, pull it at the right temperature, and let it rest. If the steak was good quality to start with, cooking time is usually the issue.

Do you need oil or butter to cook fillet steak?

You need a small amount of fat to stop the steak sticking and to help with heat transfer. A neutral oil with a high smoke point works well for the initial sear. Groundnut or sunflower oil are both fine. Butter burns at high heat, so add it towards the end if you want the flavour. Drop a knob into the pan during the last minute and spoon it over the steak as it melts. That adds richness without burning.

Can you cook a thick fillet steak in the pan alone?

You can, but steaks thicker than about three centimetres are easier to finish in the oven. Sear both sides in a very hot pan to get colour, then transfer the whole pan into an oven preheated to 180 degrees Celsius. Check the internal temperature after three or four minutes. This method heats the steak more gently and avoids overcooking the outer layers while you wait for the centre to come up to temperature.

Find a farm shop or farmers market near you, ask about grass-fed beef, and cook it with the care it deserves. That’s the whole point of buying direct.

Author: Isla Harper

Isla writes about rural life, farm shops, and discovering the best places to buy directly from producers. She enjoys exploring local markets, small farms, and independent growers, sharing stories that highlight the people behind the food. Her work helps readers find trusted places to shop while celebrating the character and community of Britain’s farming landscape.