Charleys Philly Steaks is celebrating National Lemonade Day by offering a free regular-size Original Lemonade with the purchase of any regular—or large-size Philly. The exclusive free lemonade deal is available at participating Charleys Philly Steaks locations on August 20.

Charleys Philly Steaks has been serving up its famous all-natural lemonade since 1986, and it is made with three simple ingredients: lemon juice, cane sugar and water.

“We can’t think of a better way to celebrate National Lemonade Day than with our famous all-natural lemonade, which has been a customer favorite for decades,” says Marketing and Public Relations Manager for Charleys Philly Steaks, Allison Short. “Our signature sweet and tart lemonade the perfect thirst-quenching drink to beat the late summer heat.”

The free lemonade deal is available in participating Charleys domestic stores and Army and Air Force (AAFES) locations worldwide.