Flank vs Sirloin Flap — What's the Difference?
Quick Answer
Flank (flank steak) and Sirloin Flap (sirloin flap) are not the same cut: Flank is flank primal (abdominal flank steak); Sirloin Flap is sirloin primal (sirloin flap / bottom sirloin flap).
Canonical entities: Flank · Sirloin Flap
Side-by-side
| flank | sirloin flap | |
|---|---|---|
| Primal | flank | sirloin |
| Muscle / location | abdominal flank steak | sirloin flap / bottom sirloin flap |
| Character | Long, fibrous abdominal cut; benefits from slicing across the grain. | Thin, loose-grained flap from the bottom sirloin; overlaps skirt/flank in some regional breakdowns. |
Key differences
- Different primals: flank vs sirloin.
- Texture and slicing: compare fibrous, grain-heavy cuts vs more tender steak-style muscles based on each cut’s description.
- Retail naming diverges by country—always map through a canonical cut when translating menus or labels.
When to use each
Flank
Pick Flank when you want its specific marbling/texture profile: Long, fibrous abdominal cut; benefits from slicing across the grain.
Sirloin Flap
Pick Sirloin Flap when its primal/muscle traits fit the dish: Thin, loose-grained flap from the bottom sirloin; overlaps skirt/flank in some regional breakdowns.
Flank and Sirloin Flap are different canonical muscles/primals: Flank is flank (abdominal flank steak); Sirloin Flap is sirloin (sirloin flap / bottom sirloin flap).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: flank (what-is) · sirloin flap (what-is) · flank hub · sirloin flap hub