McDonald's introduces limited-time Big Mac sauce dipping option.

McDonald's will offer Big Mac sauce for dipping in limited-time dip cups starting April 27 at participating restaurants. Customers can get the sauce for free with Chicken McNuggets or purchase it à la carte with other menu items. The dip cup packaging will feature blue and silver colors as a throwback to the original Big Mac sandwich wraps. McDonald's recently enhanced its classic burgers, including the Big Mac, with softer buns, juicier caramelized onions, and perfectly melted cheese.