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Preheat the oven to 400°F.
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Line a baking sheet with parchment paper or foil.
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In a medium bowl, combine the egg whites and sea salt.
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Knead with your hands until a thick paste is formed.
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Fill the cavity of the fish with a mixture of lemon, onion, garlic, celery, leeks, and dill. Coat fish with olive oil. Put the fish on the prepared baking sheet.
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Mould the salt paste evenly over the entire fish. Make sure there are no holes in the salt paste.
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Bake the fish until the crust is golden brown and very firm, about 45 minutes.
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Slide the parchment and fish onto serving platter or cutting board. Allow to rest for 5 minutes.
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Crack the crust with the back of a large knife and discard the crust. Garnish with haricot verts, Kalamata olives, lemon slices and egg.