Hayashi rice usually contains what predominant ingredient?

Hashed beef rice or Hayashi rice is a dish popular in Japan as a Western-style dish. It usually contains beef, onions, and button mushrooms, in a thick demi-glace sauce which often contains red wine and tomato sauce. This sauce is served atop or alongside steamed rice. The sauce is sometimes topped with a drizzle of fresh cream.

The dish originates from the former mining town of Ikuno, Hyōgo Prefecture, Japan. There was a French engineer who worked for the mine in 1868 and improved it. Hayashi rice has a western influence with the use of demi-glace and often red wine, but is unknown in western countries. In fact, it contains ingredients popular in Japan: slices of beef (Hyōgo Prefecture is also famous for its Kobe beef), rice and demi-glace sauce (among others). It can be compared to another popular dish, the Japanese style hamburger steak with demi-glace sauce. Another variation is the Omuhayashi, a combination of Omurice and Hayashi rice. It also resembles a Japanese curry and usually appears on menus alongside curry.