Can I pressure can roasted sweet peppers without sugar or vinegar? I want the naturally sweet flavor of the pepper preserved, so no pickling or added sugar is desired. Can I pressure can sweet fire roasted peppers without sugar or vinegar, or are those required for safety?
Peppers are a low acid food, so under home conditions, pressure canning will be required to do so.

See for example:  NCFHFP recipe for peppers.