Rice Cooker Japanese Ketchup Rice

Bahan-bahan (4 porsi)

• 1½ cups uncooked Japanese short-grain white rice
• 1¼ cups water
• ½ onion
• 6 oz boneless, skinless chicken thigh ((can substitute it with bacon, sausages, or mushrooms))
• 2 Tbsp green peas ((cooked))
• ⅓ cup ketchup
• 2 tsp Worcestershire sauce
• 1 tsp Diamond Crystal kosher salt
• freshly ground black pepper ((to taste))
• 1 bay leaf ((dried))
• 1½ Tbsp butter