Ingredients

• 1 (15-oz) cold container whole-milk ricotta (1 2/3 cups) or 1 2/3 cups fresh ricotta
• 3 oz cream cheese, softened
• 1 cup cold whole milk
• 1 cup sugar
• 2 tablespoons dark rum
• 1 teaspoon finely grated fresh lemon zest
• 1/2 teaspoon vanilla
• 1/8 teaspoon salt
• 1/3 cup cold heavy cream
• 1 (4 1/2- to 5-lb) wedge of watermelon, cut into 1-inch-thick slices and chilled
• 1 oz fine-quality bittersweet chocolate (from a 3-oz bar), shaved (1/4 cup)
• Special equipment: an ice cream maker

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Instructions

1. Blend cheeses, milk, sugar, rum, zest, vanilla, and salt in a blender until smooth, about 1 minute. Add cream and blend until just combined, about 5 seconds.
2. Freeze mixture in ice cream maker, then transfer to an airtight container and put in freezer to harden, at least 3 hours.
3. Put scoops of ice cream on watermelon slices and top with chocolate shavings.