Grass-Fed Dry-Aged Ribeye Steak with Café de Paris Butter & Crushed Jersey Royals

The ribeye — sometimes called the rib eye steak, scotch fillet in Australia, or entrecôte in France — is cut from the longissimus dorsi, the long back muscle that runs from the neck to the rump, specifically from ribs six to twelve. Because this muscle does relatively little work (the animal's weight is carried by its legs; the back merely stabilises), the fibres are fine, the connective tissue minimal, and the intramuscular fat — marbling — is at its most generous of anywhere on the carcase.

What makes the ribeye uniquely special is a second muscle: the spinalis dorsi, a crescent-shaped cap that wraps around the outer edge of the eye. The spinalis does almost no structural work at all, and as a consequence is the most heavily marbled, most tender and most intensely flavoured muscle on the entire animal. Many experienced steak eaters regard it as the single best bite of beef available. When examining a ribeye at the counter, look for a well-defined spinalis — its characteristic fan of marbling is visible even through the packaging — and ensure the central eye has an even distribution of fine, white fat threads throughout. A single thick seam of external fat running along the back is correct anatomy; you want the fat distributed within the muscle, not only around it.

Our grass-fed ribeyes are dry-aged for a minimum of 28 days. During this time the calpain enzymes naturally present in beef muscle work outward from the bone, breaking down the proteins that cause muscular rigidity. The result is a steak that is already more tender than any wet-aged equivalent before it hits the pan, with a concentrated, almost nutty beef flavour that intensifies noticeably compared to fresh meat. The fat develops a particular richness during ageing — a buttery, slightly caramelised quality — that renders beautifully under high heat and mingles with the café de Paris butter in a way that would be impossible with commodity beef.

Choose steaks of at least 3cm thickness — 3.5–4cm is ideal. A thinner cut reaches the target internal temperature before a proper crust can form. Weight of 280–320g per person delivers a satisfying portion that still allows time in the pan.

The café de Paris butter is one of the oldest tricks in the professional kitchen playbook for one very precise reason: it solves the problem of flavour intensity at high temperatures. When you cook a steak at the heat required to build a proper Maillard crust — above 140°C at the surface, typically achieved with a pan surface temperature closer to 200–250°C — any delicate herb or compound you add to the pan will burn and turn acrid within seconds. The compound butter circumvents this entirely: applied off the heat during the rest, it melts slowly into the crust from the top, carrying its complex cargo of umami (anchovies, Dijon), brightness (lemon, capers), herbaceousness (tarragon, parsley) and warmth (curry, cayenne) without any of them being destroyed by direct heat. The result is a sauce that tastes as though it was assembled in a proper kitchen, from ingredients that were each treated correctly.

The basting step — adding butter, thyme and garlic to the pan for the final 60–90 seconds — works on a different principle. Butter contains milk proteins that brown and develop their own complex Maillard flavours at around 150°C. Tipping the pan and spooning this browning butter over the surface of the steak effectively conducts additional Maillard browning on the top surface without the direct contact that would require flipping and risk of overcooking. The thyme and garlic perfume the butter instantly, and those aromatic compounds are fat-soluble — they adhere to the steak surface more effectively than any water-based marinade could.

Jersey Royals need no gilding, but crushing them — rather than mashing or keeping whole — creates more irregular surface area: jagged, starchy edges that crisp slightly in the residual butter heat and provide grip for the café de Paris butter as it pools and runs. They are the right potato for this dish.

The café de Paris butter recipe above is the classic Swiss brasserie version, but there are as many variants as there are kitchens. You can omit the anchovy if you need the dish to be pescatarian-friendly (it will be less deeply savoury but still excellent); add a teaspoon of brandy or cognac for a richer, more luxurious note; or substitute marjoram for the tarragon if fresh tarragon is unavailable — the anise note will be absent but the butter still very good. A pinch of ground mace in place of the curry powder gives a more subtle, old-English warmth.

If ribeye is unavailable, a well-marbled sirloin steak handles this recipe well (slightly firmer texture, less fat, very good flavour). Rump steak from a good dry-aged animal — ours is grass-fed and aged 28 days — is an outstanding budget alternative: more textured than ribeye, with a pronounced mineral beef flavour, and brilliant with café de Paris butter. Avoid using fillet for this recipe; its lean profile and mild flavour are overwhelmed by the compound butter rather than enhanced by it.

Jersey Royals have a very short season — typically late April to mid-July — and nothing quite replaces them. Outside this window, Charlotte, Anya or Ratte potatoes are the closest equivalents in terms of waxy texture and buttery flavour. For a lower-carbohydrate alternative, wilted spinach with a squeeze of lemon works very well alongside the butter-rich steak.

The café de Paris butter is the make-ahead centrepiece of this recipe. Rolled and wrapped, it keeps for 5 days in the fridge and 3 months in the freezer; slice from frozen and rest for 10 minutes at room temperature before using. The butter actually improves over the first 24 hours in the fridge as the flavours meld. The potatoes can be boiled and kept warm, or boiled in advance and re-crushed with fresh butter when reheating. The steaks should be cooked and served immediately — leftover ribeye can be sliced thinly and eaten cold in sandwiches with horseradish the following day, but reheated steak is a diminished thing.

The crushed Jersey Royals and watercress are all this dish needs. If you want to extend the meal, a simple starter of cold asparagus with vinaigrette works well with the season; or a green salad with a sharp mustard dressing after the steak, French-style. If cooking for more than two, roast a tray of cherry tomatoes on the vine at 180°C for 20 minutes alongside — their acidity balances the richness of the butter beautifully. Sourdough on the table is useful for mopping.