What is the primary ingredient used in sautéed onions?

The primary ingredient used in sautéed onions is margarine and seasonings. When sautéing onions, margarine acts as the fat that helps to cook the onions evenly while adding a rich flavor. Seasonings can enhance the taste further, allowing for a savory experience that complements the natural sweetness of the onions as they caramelize.

The combination of margarine and appropriate seasonings is crucial for achieving the desired texture and flavor in sautéed onions, making this answer the most accurate in the context of typical preparation methods used in restaurants like Texas Roadhouse. Other options focus on different ingredients or combinations that either do not directly apply to sautéing onions or would lead to a different culinary outcome.