Jill's Spicy Mussels in White Wine

Ingredients

• 1/3 cup olive oil
• 1/2 onion, thinly sliced
• 4 large garlic cloves, chopped
• 2 teaspoons fennel seeds
• 1 teaspoon dried crushed red pepper
• 1/2 teaspoon salt
• 2 1/4-inch thick lemon slices
• 1 cup dry white wine
• 1/2 cup chopped fresh parsley
• 2 1/2 pounds fresh mussels, scrubbed, debearded
• 1/2 cup chopped seeded tomatoes