Strawberry Ice Cream Soda

1 pound strawberries
1/2 cup sugar
3 Tablespoons strawberry jam
1 pint vanilla ice cream
1 pint strawberry ice cream
Sparkling water

Line a rimmed baking sheet with parchment paper. Scoop the ice cream onto the paper and freeze until ready to use.
Rinse the strawberries and cut the stems off. Add to a medium saucepan with sugar and jam. Bring to a boil. Reduce heat to low, and cook for 10 to 15 minutes, or until the berries have broken down and are soft. Put the strawberry sauce through a strainer to get rid of the seeds. Pour the syrup into a bottle.
Slice a strawberry almost all the way through and attach to the side of the glass. Add a scoop of vanilla and a scoop of strawberry to a glass. Pour about 2 tablespoons strawberry syrup over the ice cream. Top with sparkling water.

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