Hi Iceman
A restaurant usually uses a deep fryer to blanch a volume of mixed peppers and chunky onions.
But what I find works even better at home, is using the Microwave.
Simple Tip, just put the chopped peppers in a micro dish, drizzle with a little olive or any oil
put the lid on and set micro on half power/ 500 @ 2min. It kind of steam/frys and par cooks perfectly.
hope this helps

cheers Chewy