That fancy vegetable dish you made was the best part of the meal.
As with other literary devices, one of the main purposes of a metonymy is to add flavor. Instead of saying, "These chicken wings, coleslaw, and green beans are delicious," you could say, “This dish is delicious.” Now, you’ve avoided naming all the separate elements of the meal, breaking up some of the awkwardness and making the sentence more vibrant.
