Position a rack in the center of the oven and pre-heat to 400°F. Fit a wire rack into a baking sheet.
In a small saucepan, melt 4 tablespoons butter over low heat. Put the panko in a large shallow bowl, add the melted butter and toss to combine. Stir in the thyme, chives, seafood seasoning, granulated onion, granulated garlic and citrus zest.
Pat the fish dry, then season with salt and pepper. Coat the fish in the egg whites, then gently press into the panko mixture to coat evenly; transfer to the wire rack. Bake until the panko is golden and the fish is opaque in the center, about 20 minutes.
Meanwhile, in a food processor, pulse the parsley and mint until finely chopped. Scrape into a dish and set aside. Return the bowl to the processor (no need to rinse). Add the peas and pulse until finely chopped (do not puree).
In a medium size saucepan, heat the EVOO and the remaining 1 tablespoon butter over medium heat. Add the shallots and cook until softened, 3-5 minutes. Add the stock and peas and bring to a simmer over medium-high heat. Cook the fresh peas for about 10 minutes or the frozen peas for 6-7 minutes; season. Stir in the parsley-mint mixture. Remove from the heat.
Spoon some peas onto each plate. Top with the fish. Serve with the malt vinegar or lemon wedges.