Japanese Chicken Donburi

In a deep 10-inch or 12-inch frying pan over high heat, stir oil, onion, and ginger until onion is lightly browned, about 2 minutes.Add broth, soy sauce, and sugar.

Add chicken to pan.

Bring to a boil.Add spinach, cover, and cook until wilted, about 1 minute.

Meanwhile, in a small bowl, beat eggs to blend.Reduce heat to low, evenly distribute mixture in pan, and pour in eggs.

With a spatula, push vegetables aside slightly so egg mixture can flow down through sauce.

Cover and cook just until eggs are softly set, 2 to 2 1/2 minutes.Meanwhile, spoon rice into bowls.

Top equally with egg-spinach mixture, including juices.

Sprinkle with tomato.