1. Aromatics: Onion slices are often used as an aromatic base for Indian dishes. When sautéed in oil or ghee, they release a sweet and savory aroma that forms the foundation of many recipes.

2. Texture and Appearance: Onion slices add texture and visual appeal to Indian dishes. They can be used to provide a satisfying crunch or a soft, caramelized texture, depending on the cooking method and recipe.

3. Flavor Enhancement: Onions are known for their ability to enhance the flavor of other ingredients. When sliced and cooked, they add a natural sweetness and depth of flavor to curries, stir-fries, biryanis, and other dishes.

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4. Versatility: Onion slices are incredibly versatile and can be used in a wide range of Indian recipes, both vegetarian and non-vegetarian. They are often combined with other aromatics like garlic, ginger, and spices to create a flavorful base for the dish.

5. Caramelization: Sliced onions can be caramelized to bring out their natural sweetness and develop a rich, deep flavor. This technique is often used in Indian cooking to create a sweet, savory base for many dishes.

6. Layering Flavors: In many Indian recipes, sliced onions are used as a base layer in the cooking process, allowing them to slowly release their flavors and meld with other ingredients, creating a complex and well-rounded taste profile.

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In summary, using onion slices in Indian cooking is an essential technique that contributes to the depth, aroma, and overall deliciousness of Indian cuisine. Understanding how to use onion slices effectively can greatly enhance the authenticity and flavor of Indian dishes.