Prepare Strawberry Mixture:

• Pour 1 tablespoon of water into a small bowl.
• Add 1 teaspoon of cornstarch and stir until dissolved. Set aside.
• Melt 1 tablespoon of butter in a medium saucepan over medium heat.
• Add 1 package of strawberries, diced into 1/4-inch pieces, and cook for 2 minutes.
• Add 2 tablespoons of sugar and 1/4 teaspoon of salt. Cook uncovered, stirring occasionally, until the liquid is reduced and thickened, about 12-15 minutes.
• Stir the cornstarch mixture again and add it to the strawberry mixture. Bring to a boil and cook until thickened, about 2 minutes.
• Allow the strawberry mixture to cool completely, then divide it in half.

Prepare Blueberry Mixture:

• Repeat the same process with the blueberries, using the remaining 1 tablespoon of water, 1 teaspoon of cornstarch, 1 tablespoon of butter, 2 tablespoons of sugar, and 1/4 teaspoon of salt. Do not divide the blueberry mixture. Set aside.

Assemble Popsicles:

• Divide the blueberry mixture evenly between 10 popsicle molds. Freeze until firm, about 3 hours.
• Once frozen, remove the popsicles and add the first layer of strawberry mixture. Insert popsicle sticks into the molds, covering with foil to secure the sticks. Freeze until firm.
• Add a layer of softened vanilla ice cream and freeze until firm.
• Add another layer of strawberry mixture and freeze until firm.
• Add the final layer of softened vanilla ice cream and freeze until ready to serve.