Arctic Char with Chinese Broccoli and Sweet Potato Purée
['3 red-skinned sweet potatoes (yams; about 2 1/2 pounds)', '1 teaspoon (or more) hot prepared Chinese mustard', '1 cup balsamic vinegar', '1 1/2 teaspoons soy sauce', '1 pound Chinese broccoli or broccoli rabe (rapini),* large outer leaves removed, cut crosswise on diagonal into 1/4-inch-thick slices', '2 slices bacon, cut into 1-inch pieces', '2 teaspoons yellow mustard seeds', '4 5- to 6-ounce arctic char fillets', '2 tablespoons vegetable oil', 'divided']
Preheat oven to 400°F. Wrap sweet potatoes individually in foil. Roast until tender, 1 to 1 1/2 hours. Cool and peel. Puree in processor until smooth. Measure 3 cups puree and transfer to microwave-safe bowl. Stir in mustard. Season with salt. DO AHEAD: Can be made 1 day ahead. Cover and chill. Boil vinegar in small saucepan until reduced to ` cup, about 8 minutes. Stir in soy sauce. Remove from heat.
Cook broccoli in pot of boiling salted water until crisp-tender, about 1 minute. Drain; set aside. Cook bacon in medium skillet over medium heat until edges are crisp. Transfer to paper towels to drain. DO AHEAD: Reduction and broccoli can be made 2 hours ahead. Let stand at room temperature.
Process mustard seeds in spice grinder until coarsely ground. Sprinkle fish with salt and pepper. Sprinkle ground seeds over top of fish. Heat 1 tablespoon oil in large skillet over medium-high heat. Add fish, mustard side down, and cook until brown and just opaque in center, about 3 minutes per side.
Meanwhile, rewarm puree in microwave until heated through. Heat 1 tablespoon oil in another large skillet. Add broccoli and bacon; sauté until heated through. Season with salt and pepper.
Divide broccoli, fish, and puree among plates. Drizzle with balsamic reduction and serve.
*Chinese broccoli is also called gai lan or Chinese kale; it's available at Asian markets. Broccoli rabe is an Italian leafy green vegetable with scattered clusters of broccoli-like florets; you'll find it at some supermarkets and at specialty foods stores.
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