Heat a large skillet, over medium-low heat, cook the bacon in the olive oil until lightly crisp and most of the bacon fat renders, about 5 minutes. Drain all but a thin layer of the reserved fat from the pan, and reserve for cooking the fish. Add the onion to the pan, and cook, stirring until wilted, about 3 minutes. Stir in the cabbage and cook until wilted, about 2 minutes. Add the water, mustard, vermouth, thyme, and allspice, and season with 1/2 teaspoon salt and pepper, to taste. Cover and cook until soft and fragrant, about 8 minutes more. (This can be done up to 1 hour ahead and reheated, covered.)

Pat the fish dry. Heat a large nonstick skillet over high heat. Add the reserved fat to the pan, and season the fish with remaining 1/2 teaspoon salt and pepper, to taste. Lay the fish, skin-side up in the pan, and cook until golden brown, about 6 minutes. Turn the fish over and continue to cook over medium to medium-high heat until the fish is opaque but not flaking, about 4 minutes more.

Divide the cabbage among 4 plates, place the fish browned side up on top and drizzle any juices over the fish. Serve.

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