What is the significance of the smell of grease in determining the quality of a restaurant's food?

The smell of grease in a restaurant can indicate the quality of the food because it suggests how well the food is cooked and how fresh the ingredients are. A strong or unpleasant grease smell may suggest that the food is not prepared properly or that the oil used for cooking is old and not changed regularly. On the other hand, a pleasant and appetizing smell of grease can indicate that the food is cooked well and with fresh ingredients, which can be a sign of good quality in a restaurant.