Key limes are smaller and have more flavor. You can also find Key Lime juice in a bottle in most supermarkets, sometimes it's in the baking aisle instead of where the juices are. If all else fails, use regular limes and add some zest to get a more intense lime flavor.
Also, check the alcohol section of the grocery, I've found it there.
I used to have a key lime tree when we lived in Florida, but when I first moved back to New England, I couldn't find key limes for my pie recipe. I found that using a larger amount of Persian (regular green limes) juice worked well. I like it much better than bottled juice. I used 1/2 cup Persian instead of 1/3 cup key lime in my recipe. Now all the grocery stores around here carry key limes in a bag, so no more problems for me.
Thanks FAClady. I baked this key lime cake last week and was finally able to find key lime juice in the produce section of my grocery store (the little green plastic bottle shaped like a lime that I don't normally like to use
But I must say, it turned out to be the only cake my DH has ever commented on about being delicious and moist! But thanks for the substitute info; that's good to know!
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