Indian Seekh Kebabs

Name: Indian Seekh Kebabs
Ingredients: For the Seekh Kebabs:; 1.1 pounds/500 grams lamb mince; 1 medium onion, finely chopped; 1/2 cup fresh coriander, chopped; 2 tablespoons plain unsweetened yogurt; 2 tablespoons lemon juice; 1 tablespoon garlic paste; 1 tablespoon ginger paste; 1 1/2 teaspoons kosher salt; 1 teaspoon garam masala; Optional: 2 to 3 green chilies, finely chopped; For Assembling and Cooking:; 4 tablespoons vegetable oil, or as needed; For serving:; 1 large onion, cut into thin rings