Salmon with Lemon, Capers, and Rosemary

INGREDIENTS

• 1/2 cup Marsala wine (or white wine)
• 1/2 teaspoon freshly ground black pepper
• 4 (6-ounce) salmon fillets
• 1/2 teaspoon salt
• 1 tablespoon minced fresh rosemary leaves
• 4 pieces of aluminum foil
• 1/4 cup lemon juice (about 1 lemon)
• 4 teaspoons capers
• 1/4 cup extra-virgin olive oil
• 8 lemon slices (about 2 lemons)