1. Preheat oven to 375°.
2. Cut 4 (15-inch) squares of parchment paper. Fold each square in half. Open folded parchment paper; place 1 fillet near fold on each square. Sprinkle fillets evenly with salt and pepper. Top evenly with lemon slices, butter quarters, and dill. Fold paper; seal edges with narrow folds. Place packets on a large baking sheet.
3. Bake at 375° for 15 minutes or until paper is puffy and lightly browned. Place 1 packet on each of 4 serving plates, and cut open. Serve immediately.
Serve with: Sweet Potato Salad