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1
Preheat the oven to 350u00b0F (180u00b0C). Butter a shallow broiler-safe baking dish 10 to 12 inches (25 to 30 cm) in diameter. Line the bottom with parchment paper and lightly butter the parchment.
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2
Using the large holes of a box grater, and with the cut side against the grater, grate the tomato halves and discard the skins. Set aside.
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3
Arrange the sole fillets on a work surface and pat dry. Sprinkle each fillet with a pinch or two of salt and cayenne pepper, then top each fillet with 1/2 teaspoons of the butter, 1 peppercorn, and 1 bay leaf half. Starting from a narrow end, roll up each fillet into a snug cylinder and place, seam side down, in the prepared baking dish. Top each fillet with 1 onion strand. Pour the white wine into the dish.
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4
Poach the fish in the oven for 15 minutes. Remove from the oven and spoon out all but about 1 tablespoon of the wine from the dish. Set the fish aside in the dish and keep warm. Position an oven rack 7 inches (17.5 cm) from the heating element and preheat the broiler.
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5
In a small saucepan, melt 3 tablespoons (45 g) of the butter over medium-high heat. Add the flour and whisk for 30 seconds to blend thoroughly without coloring. Add the stock, cream, and grated tomato and bring to a boil, whisking constantly. Turn down the heat to medium and cook, whisking constantly, until thickened, about 5 minutes. Add the parsley, then whisk in the remaining 2 teaspoons butter, 1/2 teaspoon at a time, whisking after each addition until melted. Season with salt and black pepper and remove from the heat.
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6
Spoon the sauce over the fish fillets and sprinkle evenly with the cheese. Broil until the sauce begins to brown, about 4 minutes. Serve immediately directly from the baking dish or transfer the fillets to individual plates with a generous serving of sauce.
