Sometimes the sun can cause jalapeno pods to darken.

I agree the black is from too much sun exposure. They taste just as good and if you leave them until they turn red the black will be gone.

Mark

Yep, Vermi and Mark nailed it.
Merely sun exposure. My Thai chiles do this on the sun side. Once ripe, you won't see it.

Josh

Yeap.... Sun Burn I have quit a few that look like that and once they turn Red you could never tell they where sun burnt.

Bill

Hmm... ok. Didn't think that plant was getting any more sun than other plants. Come to think of it though, jalapenos don't have a whole lot of foliage where those very first pods start.

Thanks guys.

Kevin

It mIght not be getting more sun than the others, might be the genetics of that plant. Similar to how some people freckle easily, who knows.

But those Tiger Jalapeno's look meaner than normal :)