Preheat the oven to 350F.
Melt the sugar in a saucepan over medium heat, stirring continuously until amber colored and smooth. Immediately pour into a greased Bundt pan and swirl to coat the bottom.
Sprinkle the Simply Desserts Gelatin Alternative over the cold water and let bloom for 5 minutes.
Add the bloomed gelatin, sweetened condensed milk, milk, eggs, and vanilla to a blender. Blend until smooth.
Pour the flan mixture into the Bundt pan.
Prepare the strawberry cake batter according to the package directions and gently scoop it over the flan mixture.
Place the Bundt pan in a larger pan filled with hot water.
Bake covered with foil for 55-65 minutes, or until the cake is set.
Cool completely, then refrigerate for at least 4 hours.
Carefully invert onto a serving plate and slice to serve.
