Pasta Jamur & Tuna ala Jepang

Bahan-bahan (2 porsi)

• 1.8 oz shimeji (brown beech) mushrooms ((½ package; or use other types of mushrooms))
• 3 shiitake mushrooms ((or other types of mushrooms))
• 3 cremini mushrooms
• 1 (5-ounce) can albacore tuna (preferably packed in olive oil) ((142 g; drained))
• 8 oz spaghetti ((4 oz, 113 g per person))
• 1½ Tbsp Diamond Crystal kosher salt ((for cooking the pasta))
• 1 Tbsp extra virgin olive oil
• ⅛ tsp freshly ground black pepper
• 1 tsp kobucha (kombucha)
• 2 Tbsp sake
• 2 Tbsp mentsuyu (concentrated noodle soup base)
• 1 Tbsp unsalted butter
• 6 shiso leaves (perilla/ooba)
• 1 Tbsp shredded nori seaweed