Burger King showcases, in its latest commercial, the Sourdough King and Breakfast Sourdough Sandwiches, available at participating restaurants nationwide for a limited-time only.

The Sourdough King features, according to the burger chain, “more than 1/2 lbs. of savory flame-grilled 100% beef, melted American cheese, thick cut bacon, freshly sliced onions & our creamy signature sauce all on a soft sourdough bun.” The Breakfast Sourdough Sandwiches include Smoked Double Bacon Breakfast Sourdough King, which is made with “double the portion of thick cut naturally smoked bacon, two helpings of melted American cheese and piled high with two fluffy eggs”, all on a sourdough bun, Double Sausage Breakfast Sourdough King, which is made with “sizzling sausage, two helpings of melted American cheese and piled high with two fluffy eggs,” all on a sourdough bun, and Double Ham Breakfast Sourdough King, which is made with “double the serving of black forest ham, two helpings of melted American cheese and piled high with two fluffy eggs,” all on a sourdough bun.

The new Sourdough King is available for a recommended price of $5.99 and the Breakfast Sourdough King collection for a recommended price of $3.69 each at participating restaurants.

After adding the Sourdough King to their menu, on March 29, Burger King has also launched a debate on social media, asking fans “Is it a burger or a sandwich?” To show them that their answers matter, the fast-food chain were invited to tweet @BurgerKing with either #teamburger or #teamsandwich, or participate in a voting poll on Burger King’s social channels.