1. Mix mayo and miso paste, stir until the mixture is very smooth
2. Trim the salmon, four pieces of fillet. Make a deep cut in each of fillet without cutting through them completely.
3. Cut four pieces of foil each large enough to enclose a salmon fillet. Spread the Miso-Mayo sauce in the middle of each foil, and then top the onion and sliced mushroom.

4. Place a portion of salmon on the sauce.
5. Spoon the remaining Miso-Mayo sauce into the cuts in the salmon and top with the cheese.
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6. Sprinkle with white sesame seeds and shichimi.
7. Seal the foil closely and bake for 10 mintures.(preheat oven to 350F)

8. Open the foil and bake for a further 5 minutes, until the cheese is lightly browned.
9. Transfer the open foil to plates and serve immediately.