Add the heavy whipping cream to a deep mixing bowl. Using a hand mixer or stand mixer, beat at high speed for about 4-5 minutes, or until stiff peaks form and the cream is light and fluffy. (It should resemble whipped cream.)
1 pint heavy whipping cream
Add the condensed milk and vanilla paste to the whipped cream. Mix at low speed just until fully combined and smooth. (Taste the mixture and, if you prefer a sweeter ice cream, mix in a little more condensed milk.)
1/2 cup sweetened condensed milk, 2 Tbsp vanilla bean paste
Pour about 1/3 of the ice cream mixture into an ice cream container, loaf pan, or metal bread pan. Sprinkle a layer of the crisp mixture over the ice cream and add dollops of the berry sauce throughout. Using a butter knife or fork, gently swirl the berry sauce into the ice cream. (Avoid overmixing so you can still see ribbons of berry sauce.)
Repeat the layering process 2–3 more times until all the ice cream mixture has been used. Smooth the top layer with a spatula, then sprinkle with the remaining crisp mixture and berry sauce. Gently swirl the top layer.
Press a piece of parchment paper or plastic wrap directly onto the surface of the ice cream to help prevent ice crystals and freezer burn, then cover tightly with a lid or foil.
Freeze for at least 8-12 hours, or overnight, until the ice cream is fully firm and scoopable.
When ready to serve, let the ice cream sit at room temperature for 4–5 minutes to soften slightly. Scoop into bowls or cones and enjoy. (For easier scooping, dip your ice cream scoop into hot water and wipe it dry before each scoop.)