鲜美 (xiān měi) specifically describes food that is both fresh and delicious, often used for soups, seafood, or just-picked produce. It emphasizes the natural, fresh flavor more than 好吃 (hǎo chī), which is a general word for 'tasty' without the 'fresh' component. 香 (xiāng) focuses on aroma, while 鲜 (xiān) alone means 'fresh' but not necessarily 'delicious'.