Step 1

The cream mixture freezes more quickly in a loaf pan than in a taller, narrower container. If you don’t have a loaf pan, use an 8-inch square baking pan.

Step 2

Process cream in blender until softpeaks form, 20 to 30 seconds. Scrapedown sides of blender jar and continueto process until stiff peaks form, about10 seconds longer. Using rubber spatula, stir in condensed milk, buttermilk,corn syrup, sugar, lemon juice, and salt.Process until thoroughly combined,about 20 seconds, scraping down sidesof blender jar as needed.

Step 3

Pour cream mixture into 8½ by4½-inch loaf pan. Dollop jam over topand swirl into cream mixture using tinesof fork. Press plastic wrap flush againstsurface of cream mixture. Freeze untilfirm, at least 6 hours. Serve.