The same muscle, M. tensor fasciae latae. Tri-tip is the US cut, often grilled Santa Maria-style; aiguillette baronne is how French butchers sell it — trimmed, and usually roasted whole.
Translation takeaway
These are near equivalents in the way butchers and cooks use them. If you can source either one, you're very close to the same result.
Keep Aiguillette baronne and Tri-tip together in your notebook.
Names by country
| Country | Aiguillette baronne | Tri-tip |
|---|---|---|
| 🇺🇸United States | — | Tri-tip |
| 🇬🇧United Kingdom | — | Tri-tip |
| 🇫🇷France | Aiguillette baronne | — |
| 🇪🇸Spain | — | Rabillo de cadera |
| 🇦🇷Argentina | — | Colita de cuadril |
| 🇲🇽Mexico | — | Tri-tip |
| 🇮🇹Italy | — | Spinacino |
| 🇩🇪Germany | — | Bürgermeisterstück |