Combine strawberries, sugar, lemon juice, and vanilla; let sit 30 min.
Beat cream, sugar, vanilla, and salt until soft peaks form.
Place cake cubes in jars, drizzle juice, add strawberries, then whipped cream.
Continue layers until jars are filled, ending with whipped cream.
Cover and refrigerate 2 hours.
Top with mint, whole strawberries, and powdered sugar before serving.