Sansai Gohan (Rice with Mountain Vegetables)

Bahan-bahan (4 porsi)

• 1 kombu (dried kelp) ((4 x 5 inches, 10 x 13 cm per piece))
• 2½ cups water
• 2¼ cups uncooked Japanese short-grain white rice
• 1 piece aburaage (deep-fried tofu pouch)
• 7 oz Sansai Mix (Sansai Mizuni)
• 3 Tbsp soy sauce ((preferably light-colored (usukuchi) soy sauce; use GF soy sauce for gluten free))
• 2 Tbsp sake
• 2½ Tbsp mirin
• ½ tsp Diamond Crystal kosher salt