Mangkuk Daging Sapi Yoshinoya (Gyudon)

Bahan-bahan (2 porsi)

• ½ onion ((3 oz, 85 g))
• 1 g reen onion/scallion
• ½ cup dashi (Japanese soup stock)
• 1 Tbsp sake
• 2 Tbsp mirin
• 1 Tbsp sugar ((or more, to taste))
• 2 Tbsp soy sauce
• ¾ lb thinly sliced beef (such as ribeye)
• 2 Tbsp pickled red ginger
• 2 servings cooked Japanese short-grain rice ((typically 1⅔ cups (250 g) per donburi serving))
• 2 onsen tamago ((optional))