Learn Italian: Il pesce con la menta è disgustoso. - The fish with mint is disgusting.

You would say Il pesce sa di menta. The verb sapere followed by di means "to taste of" or "to smell of". Notice that when using sapere di to describe a flavor, we usually drop the article (just di menta, not della menta), whereas con la menta requires it.

Why do we use the article in con la menta instead of just saying con menta?

Italian uses definite articles much more often than English, including for broad categories of food and ingredients. When pairing items with con, the article is generally kept. You will also frequently see dishes described with a combined with a definite article, like pesce alla menta, which emphasizes that it is "mint-flavored" rather than just fish served alongside mint.

In English, "fish" can be both singular and plural. Is pesce the same?

No, pesce is strictly singular. If you are referring to multiple distinct whole fish, you must use the plural pesci and adjust the rest of the sentence: I pesci con la menta sono disgustosi. In this sentence, Il pesce refers either to a single fish or to the uncountable mass noun of fish as a dish.

Does disgustoso carry the exact same harshness as "disgusting" in English?