Grilled Swordfish Steaks with Cucumber Sauce

Name: Grilled Swordfish Steaks with Cucumber Sauce
Ingredients: 1 cucumber - peeled, seeded, and minced; 1 cup sour cream; 1 tablespoon lemon juice; 1 teaspoon lemon zest; salt to taste; 2 tablespoons olive oil; 0.5 cup minced onion; 2 cloves garlic, minced; 1 cup tomato-based chili sauce; 2 tablespoons apple cider vinegar; 2 teaspoons Worcestershire sauce; 0.125 teaspoon ground black pepper; 2 pounds swordfish steaks, cut 1 1/2-inches thick; 2 teaspoons olive oil; 1 lemon, thinly sliced