Start by measuring out 150 g cooked Japanese short-grain rice.
Separate the yolk and white of 1 pasteurized egg.
Pour the egg white over the rice and add 1 tsp Japanese soy sauce (koikuchi shoyu), ¼ tsp oyster sauce, ⅛ tsp toasted sesame oil, ⅛ tsp dashi granules, ⅛ tsp sugar, and 1 pinch salt.
Mix thoroughly for about 10-15 seconds or until the ingredients are combined and every grain is evenly coated.
Make a bed of finely chopped green onions and place the egg yolk in the center.
Mix before eating and enjoy with your favorite toppings!
Notes
Always use pasteurized eggs intended for raw consumption, or source fresh eggs from a trusted supplier specifically labeled safe for raw use.
It's also common to just add the egg straight to the rice (rather than whisking it separately).
It's important to mix thoroughly before eating.
Tip: I often freeze 150g portions of cooked rice and then simply microwave when I make tamago kake gohan, this is convenient in the morning when time is limited!