Chimichurri is best served just after it's made, but if you have any left over, the sauce will hold in the refrigerator for a few days. Use to top roasted chicken, oven-roasted potatoes, fried eggs, or almost anything else that's simply seasoned. Mix it with Greek yogurt to create a dip, or work in a bit of mayonnaise for a creamy and herb-packed spread for a sandwich.