Sanpeijiru (Sup Salmon Jepang)

Bahan-bahan (4 porsi)

• 1 lb salmon scraps
• 3 fillets Homemade Japanese Salted Salmon
• 4 cups water
• 1 piece kombu (dried kelp) ((2 x 3 inches, 5 x 8 cm per piece))
• 8 inches daikon radish
• 1 carrot
• 2 Tokyo negi (long green onion) ((or 4 scallions/green onions))
• 2 potatoes ((I use Yukon gold potatoes as they don‘t break easily compared to russet potatoes))
• 4 Tbsp sake
• 1 tsp Diamond Crystal kosher salt