key lime pie       
noun [ C or U ] (also Key lime pie) uk/ˌkiː ˌlaɪm ˈpaɪ/ us/ˌkiː ˌlaɪm ˈpaɪ/
 酸橙派(由墨西哥青柠、鸡蛋和炼乳为主要原料做成的酥皮馅饼)
a sweet food made from key limes, eggs, and condensed milk (= thick, very sweet milk sold in a can), usually on a pastry base and sometimes with meringue (= light, sweet food made by mixing sugar with egg white) on top
  Key lime pie is a popular American dessert. 
For dessert, mum baked a key lime pie with meringue on top.  甜点是妈妈烤的一个酸橙派,上面放着蛋白糖酥。 
 - More examples
 - As much as I would like to have a second helping of potatoes, I am saving room for key lime pie.
 - If you eat at Elsie's Diner, you should try the Key lime pie; it's the best in the state.