Ingredients

• 1 tablespoon fennel seeds
• 1/2 cup (1 stick) butter, room temperature
• 1 tablespoon fresh lemon juice
• 2 teaspoons Dijon mustard
• 1 garlic clove, minced
• 1/4 cup olive oil
• 2 tablespoons fresh lemon juice
• 1 garlic clove, minced
• 6 skinless boneless chicken breast halves, pounded to 1/3-inch thickness
• 4 anchovy fillets, chopped
• 4 cups thinly sliced radicchio
• 2 tablespoons drained capers

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Instructions

1. Stir fennel seeds in small skillet over high heat until beginning to brown, about 1 minute. Place in spice mill and grind to coarse powder. Transfer to small bowl. Add remaining ingredients; stir to blend. Season with salt and pepper. (Can be made 2 days ahead. Cover and chill.)
2. For Chicken: Whisk oil, lemon juice, and garlic in small bowl to blend. Place chicken in 13x9x2-inch glass baking dish. Sprinkle with salt and pepper. Pour oil mixture over. Turn to coat. Cover with plastic wrap; refrigerate at least 1 hour and up to 3 hours. Heat 2 heavy large skillets over medium-high heat. Add 3 chicken breasts with some of marinade to each skillet; sauté until cooked through, about 3 minutes per side. Transfer chicken to platter. Place 2 teaspoons fennel-mustard butter atop each chicken breast. Melt 1/4 cup mustard-fennel butter in 1 skillet over medium-high heat. Add anchovies; mash with fork. Stir in radicchio and capers; sauté until radicchio just begins to wilt, about 1 minute. Spoon radicchio atop chicken breasts.
3. Whisk oil, lemon juice, and garlic in small bowl to blend. Place chicken in 13x9x2-inch glass baking dish. Sprinkle with salt and pepper. Pour oil mixture over. Turn to coat. Cover with plastic wrap; refrigerate at least 1 hour and up to 3 hours.
4. Heat 2 heavy large skillets over medium-high heat. Add 3 chicken breasts with some of marinade to each skillet; sauté until cooked through, about 3 minutes per side. Transfer chicken to platter. Place 2 teaspoons fennel-mustard butter atop each chicken breast. Melt 1/4 cup mustard-fennel butter in 1 skillet over medium-high heat. Add anchovies; mash with fork. Stir in radicchio and capers; sauté until radicchio just begins to wilt, about 1 minute. Spoon radicchio atop chicken breasts.