Toasted Brioche Ice Cream with Raspberry Caramel Swirl

Name: Toasted Brioche Ice Cream with Raspberry Caramel Swirl
Ingredients: 1 cup fresh or frozen raspberries; 2 tablespoons dried hibiscus flowers; 2 tablespoons water; 1 tablespoon lemon juice; 1/2 cup granulated sugar; 2 tablespoons corn syrup; 1/4 cup heavy cream (at room temperature); pinch sea salt; 2 slices brioche bread (or whatever your favorite bread for toast is); 1 teaspoon salted butter (softened); 1 1/2 cups heavy cream (divided); 1 1/2 cups whole milk (plus more as needed); 2/3 cup granulated sugar; 1/4 teaspoon sea salt; 5 large egg yolks; 1/2 teaspoon vanilla extract