Place strawberries in a large saucepan (enamel or stainless). Add sugar and ascorbic acid mixture. Cook over low heat and stir until sugar dissolves.
Continue cooking for 20 minutes, stirring occasionally. Remove from heat; ladle into a 1 1/2 to 2 pint freezer container or clean 1/2 pint can/freeze jars. Wipe edges with a damp paper towel. Seal, label and freeze.
Makes 1 1/2 pints jam or three 1/2-pint can/freeze jars.
To can instead of freeze, ladle into canning jars and wipe rim. Seal and process in a boiling water bath for 15 minutes.