Burger King is giving its customers an inside peek into exactly what goes into making a Whopper as it boasts about its natural ingredients.

The fast-food chain announced on Thursday that the Whopper has no colors, no flavors, and no preservatives from artificial sources. The chain also states that the Whopper also has no MSG and no high-fructose corn syrup.

The company is so proud of the Whopper’s natural makeup that it has posted the recipe to make the burger right on the sandwich wrapper for all to see.

The recipe, which is only available for a limited time, is listed as 100% flame-grilled beef, tomatoes, lettuce, mayo, ketchup, pickles, onions, and a sesame seed bun.

Burger King said the move is part of an effort to promote “real food and high-quality ingredients.” The company also said it has removed about 8,500 tons of artificial ingredients from its menu items globally.

“We know that real food tastes better and are working hard to remove all preservatives, colors and flavors from artificial sources from the burgers and food we serve in all countries around the world,” Fernando Machado, global chief marketing officer, Restaurant Brands International (QSR), the owner of Burger King, said in a statement.

The Whopper is not the only menu item that is free of the artificial ingredients, as Burger King said that 85% of its menu has no colors, no flavors, and no preservatives from artificial sources, with a goal of reaching 100% natural ingredients by the beginning of next year.

Shares of Restaurant Brands International were trading at $55.35 as of 11:53 a.m. EDT, down 47 cents or 0.84%.

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Burger King's Whopper has the recipe printed on the wrapper for a limited time. Burger King