Here's the trick to get "key lime" juice when one hasn't any key limes.
Use Persian (regular) limes, juice them, and add lemon juice, in a ratio of 1 part lemon juice per 4 (or 5, to taste) parts lime juice. I generally add the lemon juice in stages, a bit at a time, stirring and tasting until the mixture is sufficiently tart. Works VERY well, I'll guarantee it.
Don't buy that ridiculously expensive bottled key lime juice, sheesh!
Hey, thank you, SAJ! That’s valuable information!
WOW!!! Cool!!!! Thank yo for that info!