Which term best describes something that has a strong or penetrating flavor?

The term that best describes something with a strong or penetrating flavor is "pungent." This word is commonly used to refer to aromas or tastes that are sharply strong and can sometimes be overwhelming due to their intensity. For example, many spices, cheeses, and certain fruits are described as pungent because they evoke a strong sensory response.

The other terms do not capture this specific quality. "Prolific" refers to the ability to produce much fruit or foliage or a high volume of work, which does not relate to flavors. "Propropriate" seems to be a typographical error or a misunderstanding; there is no such term typically used in this context. "Prosaic," on the other hand, describes something that is mundane or lacking in poetic beauty, thus not associated with strong or penetrating flavors.