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A lot will depend upon how hot you want it. Leave the seeds and membrane or remove them, etc...
I eyeball it at around .5-1 deseeded jalapeno per pound of meat, depending upon the size of the jalapenos. I also blanch mine prior to dicing up for use.
I buy my jalapenos from a Farmer's Market here locally. In the past they have had some issues with the types of fertilizers being used that could possibly carry listeria or other gastrointestinal nasty critters. I also grow some of my own and I use a manure based fertilizer that I get from one of the local farmers...
The local health department recommends blanching if the veggies could be consumed by anyone with a weakened immune system (my wife).
That's why I do it and I've gotten used to typing it... LOL