The fast-food chain that made its fame on a rice dish topped with American beef announced Wednesday that "gyodon" will return Sept. 18 after a two-year hiatus caused by the mad cow scare.

But Yoshinoya D&C Co. will have just 1 million servings, which are likely to sell out before the day is over, Yoshinoya President Shuji Abe said.

The chain, which operates about 1,000 restaurants nationwide, won't be able to regularly offer its famous gyudon, as it can't procure a sufficient supply of American beef because of the government's decision to allow in only U.S. beef from cattle aged 20 months or younger.