Shake Shack finally adding avocado -- and 2 limited-time sandwiches that feature it

The Shake Shack team is at it again, this time finally adding to its offerings one of the most highly requested items: avocado.

The fast-casual burger joint will be offering the new avocado bacon burger and avocado bacon chicken sandwich at all U.S. locations through June 30.

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Shake Shack adds avocado and two new sandwiches to its menu

A Shake Shack spokesperson told ABC News that the fruit will be a permanent addition to the menu.

Both sandwiches are topped with freshly sliced avocado and feature applewood-smoked bacon from Niman Ranch, a network of over 740 small family farmers and ranchers who raise sustainable and Certified Humane livestock.

The burger also gets a slathering of the signature Shack Sauce (pricing starts at $7.89), and the chicken sandwich comes with lettuce, pickles and buttermilk herb mayo (starting at $8.79).

Shake Shack's culinary team told "Good Morning America" that with avocado being "one of the most-requested items to date" that it will stay on the menu permanently as an add-on for any sandwich at $1.25.