Japanese Sweet Potato Rice (Satsumaimo Gohan)

Bahan-bahan (6 porsi)

• 2¼ cups uncooked Japanese short-grain white rice
• 2 Japanese sweet potatoes ((14 oz, 410 g))
• 1 Tbsp sake
• 1½ Tbsp mirin
• 1½ tsp Diamond Crystal kosher salt
• 2⅓ cups water
• 2 tsp toasted black sesame seeds
• ½ tsp Diamond Crystal kosher salt