Tuna with Oranges & Shiitakes

Cooking fish en papillote (in parchment paper) is one of the cleverest tricks in French cuisine, and it turns a simple tuna steak into a restaurant presentation at the dinner table. Each package puffs dramatically in the oven as the juices steam the fish, and opening it at the plate releases a cloud of orange-thyme fragrance that cannot be replicated by any other method.

The citrus is doing serious flavor work here. Fresh orange segments (called supremes) release sweet juice into the parcel while orange juice concentrate adds concentrated depth the fresh fruit alone cannot supply. The one teaspoon of soy sauce is a quiet umami move that balances the sweetness and keeps the packet savory.

Shiitake mushrooms are the right choice over button mushrooms. Their meaty texture and intense umami stand up to the orange and tuna, and they release just enough earthy liquid during the bake to build body in the sauce without making things soggy.

The puffed-package visual cue is the doneness indicator; 10 to 12 minutes at 400°F (200°C) is typically perfect for tuna left slightly pink in the center. Over that and the fish turns chalky and dry.

Chef Tips

• Cut parchment into large heart shapes, fold in half, and crimp the edges tightly to trap steam; loose packets leak and fail to puff
• Use supreme-cut orange segments rather than slices; no bitter pith, and the segments hold their shape beautifully through the bake
• Serve the packets directly on dinner plates and let each person open their own; the aromatic burst is half the experience
• Fresh thyme over dried; the delicate flavor comes through strong in the steam, while dried thyme can taste dusty in such a delicate preparation

Variations

• Swap tuna for salmon, halibut, or cod, adjusting bake time a minute or two for thickness
• Use grapefruit or blood orange segments in place of regular orange for a more tart, colorful plate
• Add a thin slice of fresh ginger to each packet for an Asian-leaning version