Step 1

Whisk the sweetened condensed milk, vanilla bean paste, vanilla extract and salt in a medium bowl until combined.

Step 2

Combine the heavy cream and sour cream in a large bowl. Beat with a mixer on medium-high speed until stiff peaks form, 2 to 4 minutes.

Step 3

Fold 1 cup of the whipped cream into the condensed milk mixture to lighten. Then add the lightened condensed milk mixture to the remaining whipped cream and fold until evenly combined and there are no white streaks.

Step 4

Transfer the mixture to a loaf pan or other freezer-safe container, cover and freeze until firm, at least 5 hours.