Serve any extra filling along with the cake, or refrigerate up to 1 week and enjoy homemade jam for breakfast!
Stir together strawberries and sugar in a large saucepan; let stand 30 minutes.
Bring strawberry mixture to a boil over medium heat; boil 5 minutes. Remove from heat, and stir in gelatin until dissolved; cool completely (about 1 hour). Cover and chill 8 hours.
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