NCHFP has the instructions. So does BBB (p. 57 in current edition). You just have to cut slits in each peppers.

Dave

Here is a link that might be useful: Pickling Hot Peppers

I don't blister the peppers, I blanch them, then slit them. I figure the boiling water will kill most of the bacteria on the outside of the peppers and the vinegar will do a great job for the rest. I have tons of very small jalapenos and this method is perfect for them. If I were to slice them into rings then I'd get loads of seeds and they would be harder to eat if you are like me who wants them whole for bites with cheese. If you use them for salads then making rings is better. I haven't used this recipe for other peppers because the jal's are the only ones I grow. For the cayenne or other small peppers my other farmer friends give me, they go into the dehydrator.
Nancy