Toshikoshi Soba (Sup Mie Soba Malam Tahun Baru)

Bahan-bahan (2 porsi)

• 7 oz dried soba noodles (buckwheat noodles)
• 4 slices kamaboko (fish cake) ((skip for vegetarian/vegan))
• 2 Tbsp dried wakame seaweed
• 1 g reen onion/scallion
• shichimi togarashi (Japanese seven spice) ((optional; for a spicy kick))
• 3 cups water
• 1 piece kombu (dried kelp) ((10 g; 4 x 4 inches, 10 x 10 cm per piece))
• 1 cup katsuobushi (dried bonito flakes) ((skip for vegetarian/vegan))
• 1 Tbsp sake
• 2 Tbsp mirin
• 2 Tbsp usukuchi (light-colored) soy sauce ((or regular soy sauce))
• ¼ tsp Diamond Crystal kosher salt
• 2⅓ cups water
• ⅓ cup mentsuyu (concentrated noodle soup base)
• 1 Tbsp mirin