Mock Key-Lime?

Lemon-Lime Squares. Recipe Adapted from Cook's Illustrated., a photo by Leenechan on Flickr.

I failed to take a nice picture of these beautiful bars. I love Key Lime pie, and this bar-cookie version is destined to be one of my new favorite recipes. I think it's amazing that in spite of all the substitutions we had to make they turned out, well, amazing.

Those substitutions being:

1). Substituting the brown sugar in the crust with turbinado sugar. Had to do it, the brown sugar was dried out as hard as cement (even though we just bought it!). Thank God we had turbinado sugar. It added a tasty crunch to the animal cracker crust. I would definitely do that again.

2). Substituting 1/2 cup freshly squeezed Key Lime or Persian Lime (regular lime) juice in the filling with 1/4 cup freshly squeezed Persian Lime juice+1/4 cup freshly squeezed lemon juice. By some miracle this turns out to be THE proper substitution for Key Lime juice, which isn't as tart as that which is squeezed from a Persian Lime. XD We had to do it because the five Persian Limes we bought (as opposed to the three the recipe called for) only produced 1/4 cup of juice. What the hell?

Juicing limes is a real bitch.