cháng xiān
尝鲜(vt.)

Meanging: Taste fresh food or use something that is little or rare for the first time.

For example:
这个新买的按摩器，先让你尝鲜。
For this new massage machine,let you use it firstly.

你没有吃过山竹，今天让你尝尝鲜。
You have not eaten mangosteen,let you taste flavor today.

Quick Test:
对味美的食物要（ ）
A.尝鲜
B.鲜嫩
C.鲜艳