Wear gloves for hot peppers. Remove cores and seeds; slit peppers. Blanch or blister skins, cool under damp cloth, peel, and flatten whole peppers.
Pack loosely and cover with fresh boiled water, leaving 1-inch headspace. Add optional salt.
Pressure process half-pints or pints 35 minutes.
Dial 11/12/13/14 psi by altitude bands; weighted 10 psi through 1,000 ft, 15 psi above.