Prparation. Le chimichurri se prpare partir de divers ingrdients persil hach finement, ail hach, huile vgtale, vinaigre blanc ou rouge, et. Add the garlic and rosemary. Stir the garlic and rosemary into the vinegaroil mixture. Pour the entire marinade into a large resealable plastic bag. First, steam tempeh for 10 minutes. This softens up the tempeh and gets it ready to soak up plenty of marinade. Meanwhile, make the chimichurri.