[Jamestown1630]

What is the difference in taste between a regular lime in the grocery and a Key lime?

We see them occasionally but I’ve never bought or used.

[boatbums]

Well, for one thing key limes are tiny compared to regular Persian limes so that little bag you see in the store will probably only give you about 1/2 cup or so of juice. But they DO have a distinctive tart taste. I've made "key" lime pie with regular limes when the key limes weren't available and it turns out fine but "real" key limes do make a difference. I really do not like the bottled key lime juice so it's better to use regular limes instead of the bottled stuff.