What specific ingredients define Katsudon layered over rice?

Answer

A deep-fried pork cutlet simmered with egg and broth

Katsudon is explicitly described as a rice bowl meal where the topping consists of a deep-fried pork cutlet, known as tonkatsu, which is then simmered along with egg in a savory and slightly sweet broth. This simmering process is crucial because it allows the flavorful broth and the soft, set egg to thoroughly soak into the underlying mound of steaming hot rice. This textural integration, where the savory sauce permeates the grains, is a defining characteristic that sets donburi dishes apart, ensuring that every bite integrates the essence of the topping with the staple rice.

What specific ingredients define Katsudon layered over rice?
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