Sirloin Flap vs Tendon — What's the Difference?
Quick Answer
Sirloin Flap (sirloin flap) and Tendon (beef tendon) are not the same cut: Sirloin Flap is sirloin primal (sirloin flap / bottom sirloin flap); Tendon is offal primal (Connective tissue at joints — particularly the hock/lower leg).
Canonical entities: Sirloin Flap · Tendon
Side-by-side
| sirloin flap | tendon | |
|---|---|---|
| Primal | sirloin | offal |
| Muscle / location | sirloin flap / bottom sirloin flap | Connective tissue at joints — particularly the hock/lower leg |
| Character | Thin, loose-grained flap from the bottom sirloin; overlaps skirt/flank in some regional breakdowns. | Collagen-rich connective tissue extracted from the leg joints, particularly the Achilles tendon area. Extremely gelatinous when slow-cooked; provides body and sticky texture to braises and soups. Prized in Korean, Vietnamese, and South Asian cuisine for its chew and the richness it adds to broth. |
Key differences
- Different primals: sirloin vs offal.
- 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
Sirloin Flap
Pick Sirloin Flap when you want its specific marbling/texture profile: Thin, loose-grained flap from the bottom sirloin; overlaps skirt/flank in some regional breakdowns.
Tendon
Pick Tendon when its primal/muscle traits fit the dish: Collagen-rich connective tissue extracted from the leg joints, particularly the Achilles tendon area. Extremely gelatinous when slow-cooked; provides body and sticky texture to braises and soups. Prized in Korean, Vietnamese, and South Asian cuisine for its chew and the richness it adds to broth.
Sirloin Flap and Tendon are different canonical muscles/primals: Sirloin Flap is sirloin (sirloin flap / bottom sirloin flap); Tendon is offal (Connective tissue at joints — particularly the hock/lower leg).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: sirloin flap (what-is) · tendon (what-is) · sirloin flap hub · tendon hub