Ingredients

• 1 (16-ounces) container chilled sour cream
• 1 cup chilled half-and-half
• 3/4 cup sugar
• 1/2 cup chilled heavy cream
• 2 teaspoons fresh lemon juice
• 1/2 teaspoon pure vanilla extract
• Equipment: an ice cream maker

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Instructions

1. Purée all ingredients with 1/8 teaspoon salt in a blender until mixture is smooth and sugar has dissolved. Chill until very cold.
2. Freeze mixture in ice cream maker. Transfer to an airtight container and put in freezer to firm up, about 6 hours.