Foryoueats: Miso Butter Mushrooms in Foil

Ingredients

• For the Seasoning:
• 2 Tbsp miso
• 2 Tbsp sake
• For the Foil Packets:
• ½ onion (3.5 oz, 100 g)
• 4 shiitake mushrooms (3 oz, 85 g)
• 1 package shimeji mushrooms (3.5 oz, 100 g)
• 1 package maitake mushrooms (3.5 oz, 100 g)
• 1 package enoki mushrooms (3 oz, 85 g)
• 2 pieces king oyster mushrooms (eringi) (4 oz, 113 g)
• 1 Tbsp unsalted butter (for aluminum foil; divided)
• For Serving:
• 2 Tbsp unsalted butter (for topping; divided)
• 1 Tbsp soy sauce (divided)
• chives (optional; or green onion)