How To Cook Fillet Steak Perfectly
Thomas Joseph Butchery — The Cook's Guide
How to Cook Fillet Steak Perfectly
The most tender steak on the animal — and the one with the least margin for error. Here is everything you need to cook fillet steak perfectly at home, from the team at Thomas Joseph Butchery.
Fillet steak is the cut that demands the most respect in the pan. It is the most tender steak on the animal — taken from the tenderloin, a muscle that does virtually no work during the animal's lifetime — but also the leanest, which means it has the least fat to protect it from the heat. Every degree beyond medium-rare costs you something: tenderness, juiciness, that defining butter-soft quality that makes fillet what it is. Cooked correctly — with a hot pan, a good baste and the discipline to pull it early — it is as close to perfect as beef gets. This guide makes sure you get it right.
"The fillet is the most forgiving cut to eat and the least forgiving to cook. A meat thermometer is not optional here — it is the most important tool on the kitchen counter."
The TJB Fillet RangeGrass-Fed Fillet Steak from Thomas Joseph Butchery
Grass-Fed Fillet Steak
Sourced from cattle raised across British and Irish farms — grass-fed, pasture-raised and aged on the carcass for depth of flavour. Cut individually to 200g or 250g portions, trimmed by our butchers and presented ready to cook. The cleanest, sweetest flavour in the steak range — and the most tender, without exception.
2 x 200g — £36 | 2 x 250g — £45
Shop Fillet Steak →
Grass-Fed Chateaubriand
Cut from the thickest, most generous section of the fillet — the head of the tenderloin — and presented as a thick-cut sharing piece for two. A different cooking approach to individual fillet steaks (pan sear followed by oven finish) but the same extraordinary eating quality. The premium fillet experience, shared at the table. See our full Chateaubriand guide for the complete breakdown.
Chateaubriand — £82.50
Shop Chateaubriand →The MethodHow to Cook Fillet Steak Perfectly — Step by Step
Bring to Room Temperature — 45 Minutes
Remove the fillet from the fridge 45 minutes before cooking. The fillet is thick — typically 4–5cm — and cold meat hitting a hot pan produces a significant temperature differential between the exterior and centre. Room temperature meat sears immediately and cooks evenly. This step costs nothing and makes a meaningful difference to the result.
Use a Cast Iron Pan — Not Non-Stick
Fillet steak requires a screaming hot surface and cast iron is the only material that delivers it reliably. Get the pan over your highest ring and leave it for a minimum of 3 minutes before anything goes in. It should be hot enough that a drop of water evaporates instantly on contact. Brush the fillet lightly with beef dripping or a high smoke-point oil — on the steak, not in the pan. Season with flaky sea salt immediately before cooking. Hold the pepper until after.
Sear — 2 Minutes Per Side, Then the Edges
Place the fillet in the pan and leave it completely undisturbed for 2 minutes. Do not move it. Flip and repeat on the second side. Then use tongs to sear the cylindrical edge of the steak — turn it slowly, allowing the entire circumference to develop colour. This takes about 2 minutes more and is worth every second. The fillet has significant surface area on its edge and leaving it unseared produces an uneven result.
Baste — 60 to 90 Seconds
This is the step that separates a restaurant fillet from a home cook result. Reduce the heat to medium. Add a generous knob of unsalted butter, a sprig of fresh thyme and a lightly crushed garlic clove to the pan. As the butter melts and foams, tilt the pan toward you and spoon it continuously over the fillet for 60–90 seconds. The butter basts the lean meat with fat it doesn't naturally contain, the thyme and garlic perfume the crust, and the result is a fillet with restaurant-level depth of flavour. Do not skip this step on a premium cut.
Oven Finish if Needed — 4 to 6 Minutes at 180°C
For a standard 200g fillet steak of 4cm thickness, the pan cook may be sufficient. For a thicker 250g steak or if you prefer medium-rare to a reliably even cook throughout, transfer the pan to a 180°C oven for 4–6 minutes after basting. Insert a thermometer and pull at 52°C — the steak will rise to 54–57°C during the rest, which is the ideal medium-rare eating temperature for fillet. If you don't have an oven-safe pan, transfer to a small roasting tray.
Rest — 5 to 8 Minutes. Always.
Transfer to a warm board and rest for at least 5 minutes — 8 for a thicker steak. Add a disc of our Sublime Béarnaise Butter directly onto the crust the moment it comes off the heat. Crack black pepper generously over both faces at this stage. The butter melts into the steak as it rests and adds the richness the lean fillet naturally lacks. Serve on a warm plate immediately after resting.
At a GlanceFillet Steak Cooking Times
| Doneness | Pull at | Rested Temp | Description |
|---|---|---|---|
| Rare | 48°C | 50°C | Bright red, very soft. Works well for fillet given its natural tenderness. |
| Medium Rare ⭐ | 52°C | 54–57°C | Pink throughout, butter-soft. The TJB recommendation for fillet. Always. |
| Medium | 58°C | 61–63°C | Slightly pink. The fillet begins to lose its defining quality above this point. |
| Well Done | 68°C+ | 71°C+ | Grey, firm. Not recommended — especially at this price point. |
🔥 The Most Common Mistake
Overcooking fillet steak is the single most common mistake — and it happens because people are nervous about serving it too pink. The fillet has no fat to protect it from the heat, which means it moves through doneness faster than any other cut. Pull it earlier than feels comfortable. A properly rested fillet at 52°C internal will reach 54–57°C — perfectly medium-rare. Trust the thermometer, trust the rest, and resist the urge to put it back in the pan.
A meat thermometer for fillet steak is not optional. It is the most important tool you own for cooking at this price point.
What to ServeThe Best Accompaniments for Fillet Steak
Béarnaise sauce — the classic pairing. Tarragon-scented, butter-rich and perfectly matched to the delicacy of the fillet. Our Sublime Béarnaise Butter is the two-minute version — melt a disc over the resting steak and serve immediately.
Pommes purée — proper butter-rich mash, passed through a ricer, is the fillet's natural accompaniment. The richness of the potato compensates for the leanness of the cut and provides the ideal vehicle for the resting juices and sauce.
Wilted spinach with nutmeg — a simple green vegetable that provides freshness and contrast without competing with the steak. Three minutes in butter with a grating of nutmeg and a squeeze of lemon. Done.
Roasted bone marrow — spooned over sliced fillet it adds fat richness that the lean cut naturally lacks and creates an extraordinary combination. One of our favourite pairings in the range.
Frequently Asked Questions
Fillet Steak — Your Questions Answered
How long do you cook a fillet steak?
For a standard fillet steak of 200–250g and 4–5cm thickness, cook for 2 minutes per side over maximum heat in a screaming hot cast iron pan, followed by 60–90 seconds of butter basting. For medium-rare, this may be sufficient for a 200g steak — verify with a thermometer at 52°C. For a thicker 250g steak, transfer to a 180°C oven for 4–6 minutes after basting until the internal temperature reaches 52°C. Rest for 5–8 minutes before serving.
What temperature should fillet steak be cooked to?
For medium-rare — the ideal doneness for fillet steak — pull from the heat at 52°C internal temperature. The steak will rise to 54–57°C during the rest, which is the perfect eating temperature. Because fillet has virtually no fat, it moves through doneness faster than any other cut. Every degree above 57°C at the rested stage costs significant tenderness and juiciness. Pull it early and trust the rest to bring it to temperature.
Should you baste fillet steak in butter?
Yes — and this step is more important for fillet than for any other steak. Because fillet has virtually no intramuscular fat, it lacks the natural self-basting mechanism of a ribeye or bavette. Adding butter (with thyme and garlic) to the pan and continuously spooning it over the steak during the final 60–90 seconds of cooking compensates for this, adding richness and flavour to the crust that significantly improves the eating experience. It is the step that most consistently separates a restaurant fillet from a home cook result.
Is fillet steak better than ribeye?
Fillet and ribeye are different rather than one being better than the other — they offer contrasting eating experiences. Fillet is the most tender cut on the animal, with a clean, delicate flavour and butter-soft texture. Ribeye is significantly richer and more intensely flavoured due to its generous marbling, but firmer in texture. Fillet suits those who prioritise tenderness and delicacy. Ribeye suits those who want maximum flavour and richness. Many serious steak lovers would argue ribeye is the more satisfying eating experience — but fillet at a premium occasion is hard to argue with.
Can you cook fillet steak from frozen?
Yes — though for premium grass-fed fillet we always recommend thawing fully in the fridge overnight and bringing to room temperature before cooking. The quality of TJB fillet steak deserves the extra care, and cooking from frozen makes precise temperature control significantly more difficult for a cut where a few degrees of overcooking matters considerably. If cooking from frozen is unavoidable, sear very briefly over maximum heat to build a crust, then finish in a 180°C oven using a thermometer to pull precisely at 52°C.
Where can I buy grass-fed fillet steak in the UK?
Thomas Joseph Butchery stocks grass-fed fillet steak in 200g and 250g portions from £36, alongside Chateaubriand at £82.50, Centre Cut Fillet and Whole Fillet. All sourced from cattle raised across British and Irish farms, cut fresh to order and delivered next day anywhere in the UK.
