Season both sides of fish with salt and pepper and set aside.
Heat 3 tablespoons oil in a saute pan and saute the garlic and ginger until fragrant; then add cilantro and green onion and cook for an additional 2 minutes. Remove from heat.
Carefully moisten 1 piece of rice paper in warm water for about 30 seconds, and then spread out on a cutting board and lightly pat dry. Place cod in the middle of paper and spread 1 tablespoon of the green onion mixture on top of the cod. Fold ends of rice paper around cod. Repeat with all 4 pieces and set cod bundles aside in refrigerator.
Preheat the oven to 400 degrees F.
When ready to serve, heat 3 tablespoons oil in a large ovenproof skillet. Add cod parcels and sear on both sides. Place skillet in oven for about 8 minutes, or until cod is fully cooked through.
Divide mashed potatoes onto 4 plates, top with cod parcels, and spoon sauce onto plate. Garnish with cilantro and lemon wedge, if desired.
Gently boil potatoes in a large pot of salted water until tender, about 20 to 25 minutes. Drain and place potatoes in a large bowl. Add butter and cream and mash with a potato masher. Fold in the cilantro. Serve immediately or keep warm until ready to serve.
Saute the mushrooms in 2 to 3 tablespoons of butter in a medium skillet over high heat for 2 minutes. Reduce heat to medium, add garlic and ginger and saute until aromatic, about 1 minute. Deglaze the pan with white wine and rice wine vinegar and cook until reduced by half. Add the remaining butter, 1 tablespoon at a time, and stir to incorporate. Season with salt and pepper, to taste.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.