Grilled Swordfish Steaks with Lemon Oregano Marinade

Name: Grilled Swordfish Steaks with Lemon Oregano Marinade
Ingredients: 1/2 cup extra virgin olive oil; 1 1/2 tablespoons lemon juice; 2 teaspoons minced fresh oregano; 2 teaspoons minced fresh thyme; 2 large cloves garlic, crushed; 1 teaspoon finely grated lemon zest; 1 teaspoon dried oregano; 1 teaspoon fennel seeds, crushed; 1/2 teaspoon freshly ground black pepper; 1/4 teaspoon kosher salt; 2 (6- to 8 - ounce) swordfish steaks; Olive oil , for oiling the grill; Fresh lemon slices, for garnish