For extra flavor, marinate the flank steak in a blend of olive oil, garlic, and herbs for a few hours before grilling. Ensure the sweet potatoes are cut into evenly sized pieces for consistent roasting. Don’t skip the chimichurri—it’s the star of the dish! Adjust the garlic and vinegar to taste for a custom zing. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days.