Canning Strawberry Jam 13. Bring to Rolling Boil Next we apply high heat to bring the mixture to a full rolling boil. A full rolling boil is one that cannot be stirred down.You need to constantly stir it during this stage. Scorched jam doesn't go over too well. ⇦ Back to - Step 12 On to - Step 14 ⇨Back to Strawberry Jam - Page 2 |