Place a 9 x 5 loaf pan into the freezer to chill.
In a large mixing bowl, use an electric mixer to beat the cold heavy cream, vanilla extract and salt until stiff peaks form.
2 cups heavy cream, cold, 1 tsp. vanilla extract, 1/2 tsp. kosher salt
Gently fold in the sweetened condensed milk until just combined.
1 (14 oz.) can sweetened condensed milk
Remove the loaf pan from the freezer and pour half of the ice cream mixture into the loaf pan.
In a small bowl, mix together raspberry and blackberry jam until fully combined. Dot half of the jam mixture across the top of the ice cream and use a butter knife to create swirls.
1/4 cup raspberry jam, 1/4 cup blackberry jam
Sprinkle half of the cashews across the top of the ice cream mixture.
1/2 cup roasted salted cashews
Pour the rest of the ice cream mixture into the loaf pan and repeat with the remain jam mixture and cashews.
Place in the freezer and chill for 6-8 hours in a level spot until the ice cream is set.
Serve in a bowl or scoop into an ice cream cone.
ice cream cones for serving