Consider using disposable gloves to protect your hands if your peppers are "very, very hot." And for the love of Pete, don't touch your eyes while you're making this.
Remove stems from peppers and slice each in half. The seeds are the hottest part of the pepper; depending on how hot you want your sauce to be, you can leave the seeds in or remove them. I was concerned about the heat, so I did discard about 3/4 of the seeds. Place pepper halves, skin side up, in a cast iron skillet or baking dish. Broil for about five minutes, until skin begins to blister and brown.
Use tongs to move peppers into the bowl of your blender. Add all remaining ingredients and puree. Pour hot sauce into a recycled glass jar or portion into smaller containers for gift giving. Store in the refrigerator.
Notes
The color of the finished hot sauce will vary depending on the peppers you use. One batch may be very red (see it here), while another (as you see above) is green. This recipe makes about a half pint of hot sauce, but you can easily double it if you like.