Soak the baguette cubes briefly in the milk in a large mixing bowl until the milk has been absorbed and the bread is soft. Pour in the white wine. Mix the bread mixture into the tomato mixture and add the olive oil.
Line a baking sheet with aluminum foil and place the fish on top. Stuff the fish generously with the tomato and bread mixture, then sprinkle the pink peppercorns on top of the fish. Sprinkle with salt and place the sliced lemons on top. Wrap the fish in the aluminum foil and bake in the oven, about 30 minutes.
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