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Cook and stir garlic in oil in a 3 quart sauce pan over low heat until garlic is brown; discard garlic.
Stir in tomatoes (with liquid), onion, butter, salt, sugar, basil, rosemary and pepper; break up tomatoes with fork.
Heat to boiling; reduce heat to slow boil. Boil uncovered, stirring occasionally, until sauce thickens (about 1 1/2 hours).
Pressure can: 1/4 inch head room, weighted gauge 10 pounds 15 minutes.
1 pint tomatoes makes 1 cup sauce.