Chimichurri is associated with great Argentine churrascarias, with servers in aprons placing a bowl of green sauce next to the meat as if revealing a house secret. We imagine a complex preparation, proportions guarded jealously. In reality, it’s a sauce anyone can put together in ten minutes, with a knife and a few ingredients almost everyone has in the fridge.

In the bowl, it looks like a dense little forest—the almost electric green of flat-leaf parsley, the bright red specks of Thai chili, all immersed in an oil that catches the light. The smell that rises at the first stir is frank, almost aggressive: raw garlic, sharp vinegar, freshly chopped herbs. Placed on a still-steaming slice of beef from the grill, the sauce changes register—the aromas soften against the residual heat, the acidity balances with the meat’s fat, and each bite becomes more interesting than the last.