CNBC reports that White Castle, which began testing the sale of meat-free Impossible Burgers in 140 locations last April, now will make the offering available at its more than 400 stores nationwide. The story describes White Castle's Impossible Sliders as “topped with smoked cheddar cheese, pickles and onions and cost $1.99 each.”

The expansion comes as a result of strong performance by the burger-like item; it has, the company says, become a cult favorite.

The story notes that “the product is made with an ingredient called soy leghemoglobin that releases a protein called heme that gives the meat substitute its distinctive blood-like color and taste. This ingredient was approved by the Food and Drug Administration in July, a big win for Impossible Foods, which has been rapidly expanding in the U.S. and abroad.

KC's View: Last time I went to a White Castle - with Michael Sansolo, as it happens - we both agreed that it would be the last time. But I’ve tried and liked an Impossible Burger (at the very nice Irving Street Kitchen in Portland), and so I’d be willing to see how the White Castle version compares.