White Castle is set to trial vegan cheese in its New Jersey and New York locations from March 1.
The US burger chain partnered GoodPlanet Foods to offer the cheese - which customers can order on any burger - but it likely to be most requested on its Impossible Slider, which is currently vegetarian (customers must request it without cheese to make it plant-based).
White Castle launched the Impossible option in April 2018, adding it as a permanent item later that year. It also offers a Veggie Slider featuring a vegan patty made by Dr. Praeger.
"Our Impossible Slider was an instant Craver [customer] favorite, but it’s about to get a new dimension with the introduction of dairy-free cheddar," said Jamie Richardson, vice president of White Castle.
"We are excited to bring this new non-dairy, vegan item to Cravers in the New York and New Jersey areas with the hope of taking it to other markets in the future.
"We're committed to innovation, and we're always looking for ways to do things better and make things better for our loyal customers. It's exciting to be the fast-food restaurant that's leading the trend in providing plant-based options for consumers."