After seeding (and reserving some of the seeds, if desired), roughly chop the peppers for easier blending.
Place all of the ingredients in a blender and purée until very smooth. Scrape down the sides as needed.
You’ll want to work your way up to the highest speed for a velvety smooth sauce.
If desired, add some of the seeds back, a little at a time, to achieve the desired level of spiciness.
Serve immediately, or transfer to a jar or bottle and refrigerate in an airtight container, where it will keep for at least 5 days.
Shake before serving.
