Beef
5:00
Steak School: Boston Sirloin Steak
A Steak School breakdown of the underrated Boston sirloin — a beefy top sirloin butt cut seasoned simply and seared hot and fast to medium-rare.
View recipe →A Steak School breakdown of picanha — the top sirloin cap and its signature fat cap — cooked three ways to a juicy medium-rare.
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| Stage | Temp | What it means |
|---|---|---|
| Medium-rare | 130–135°F / 54–57°C | The target. Beneath the cap it is lean sirloin, so it dries past medium. |
| Fat cap | Rendered and crisp | Scored and given real time. Under-rendered fat is chewy and unpleasant. |
| Too far | 145°F+ / 63°C+ | The cap does not protect the lean muscle underneath from overcooking. |
| Rest | 10 minutes | Before carving across the grain. |
Cooked picanha keeps 3–4 days refrigerated. Store it in one piece with the fat cap intact rather than pre-sliced — the cap keeps the meat under it from drying out in the fridge. Reheat gently, or slice cold; the rendered cap firms up when chilled, so warming briefly makes leftovers much better than eating them straight from the fridge.
Raw picanha freezes for 6–12 months wrapped airtight. Buy it whole with the cap on if you can, since many supermarkets trim the cap down to a quarter inch and that removes most of what makes the cut special. Thaw overnight in the fridge.
Top sirloin cap, rump cap, coulotte or culotte. It is the biceps femoris cap that sits on top of the top sirloin, with its thick fat cap attached. Many North American butchers separate it and sell the pieces as sirloin steaks, which is why you often have to ask for it specifically.
No — score it, do not remove it. The fat cap is the defining feature of the cut and the source of most of its flavour; as it renders it bastes the lean muscle underneath. Scoring in a crosshatch helps it render evenly and crisp instead of shrinking and curling the meat.
Because you slice against the grain later, on the board. Portioning with the grain gives you steaks whose fibres all run the same direction, so each one can then be carved across them. Cutting the whole piece against the grain first leaves you with steaks you cannot slice properly.
130–135°F for medium-rare. Beneath that famous fat cap it is a lean sirloin muscle, so the cap does not make it forgiving of overcooking — it just makes the outside taste better while you get the inside right.
Top sirloin cap, rump cap, coulotte or culotte. It is the biceps femoris cap sitting on top of the top sirloin with its fat cap attached. Many butchers break it down into ordinary sirloin steaks, which is why you often have to ask for it specifically or cut it yourself.
No — score it, do not remove it. The fat cap is the defining feature of the cut and the source of most of its flavour; as it renders it bastes the lean muscle underneath. Scoring in a crosshatch helps it render evenly and crisp instead of shrinking and curling the meat.
No 500-word life story — just the good-to-know stuff on what’s actually in this cook. Here’s the rundown on every real ingredient, health and nutrition wise.
General nutrition info only, not medical or dietary advice — portions, brands and add-ons change the numbers.