I discovered the Mattapeño when I was working at a commercial greenhouse many years ago.  I found a jalapeño with variegated leaves and knew it was something unique, as we were not growing any variegated peppers that year.  I took it home and spent years growing out subsequent generations until I had a beautiful, white-leaved, purple-stemmed, heavily variegated jalapeño with stripes on the peppers!  
 
The Mattapeño is unlike any other jalapeño pepper you have grown.  I have taken great care to foster the unique genetics and have created dozens of new peppers by crossing the Mattapeño with other rare chili peppers over the last few years. 
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More info can be found here: http://thehotpepper.com/topic/74475-variegated-jalapeno-grow-log
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Join the Mattapeño FB group to see plants others are growing: facebook.com/groups/mattapeno