McDonald’s (MCD) is bringing back one of its most popular dipping sauces for a limited time – Szechuan sauce.

The fan-favorite sauce will be back while supplies last starting on March 31, exclusively on the McDonald’s App. The dipping sauce will only be available nationwide for a few days, the fast-food chain said.

Customers will be able to add five of the Szechuan sauces to their order of Chicken McNuggets in the McDonald’s App for free. Up to five Szechuan sauces can also be purchased a la carte in the McDonald’s App.

McDonald’s Szechuan sauce has a savory and slightly sweet taste, flavored with hints of soy, garlic, ginger and mild vinegar notes. The sauce will come in a specially designed gold-foil packaging that spells out “Szechuan.”

McDonald’s has only brought back the popular dipping sauce three other times in the past 24 years. The sauce debuted in 1998 as part of a promotion that coincided with the Disney animated film “Mulan,” according to USA Today. It came back again for one day in 2017, nearly 20 years after its debut, and again in 2018, the news outlet said.

This is not the first time that McDonald’s has brought back a coveted menu item in recent months. Back in November, the chain revived the McRib at restaurants after a one-year hiatus. The Shamrock Shake also made a reappearance on the menu in late February this year after disappearing for a year.

As of Monday premarket hours, shares of McDonald’s were trading at $239.69, up 77 cents, or 0.32%.

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