Although they are both parsley, there is a difference in taste and texture between these two varieties. French curly parsley is a delicate herb that's mild in taste with a slightly grassy flavor. Italian flat-leaf parsley offers a bolder, more herbaceous, and aromatic taste. Flat leaf parsley is better for use in hot dishes because it retains more of the texture and flavor, although it's still best added just before serving since heat can destroy the delicate flavor. Curly parsley is especially good in chilled recipes like tabbouleh and fresh salads. If you’re in a pinch, you can always substitute one for the other though.