Authentic Shoyu Ramen

Ingredients

• 2 oz dried kombu (about 2 large pieces)
• 4 qt cold water
• 1 cup soy sauce
• 1/2 cup sake
• 1/2 cup mirin
• 2 1/2 lb boneless pork shoulder
• Kosher salt
• freshly ground black pepper
• Kitchen twine
• 2 tbsp neutral oil
• 1 1/2 lb pork spareribs
• 1 1/2 lb chicken wings
• 1 bunch scallions (halved)
• 2 carrots (roughly chopped)
• 1 head garlic (halved crosswise)
• 4 inch piece ginger (sliced)
• 1 cup bonito flakes (katsuobushi)
• 6 large eggs
• 1 1/2 lb fresh ramen noodles (or 12 oz dried)
• 1/2 cup menma (fermented bamboo shoots)
• 3 sheets nori (halved)
• 4 scallions (thinly sliced)
• Chili oil, sesame oil, and shichimi togarashi for serving