At a glance
You're making creamy homemade ice cream without an ice cream maker — just a bowl and freezer. The trickiest part is whisking the mascarpone and cream to the perfect thickness without overdoing it, but once you've got that down, you'll layer in a silky peanut butter swirl and create a beautiful marbled pattern with a knife. After 6+ hours in the freezer, you'll have an elegant no-churn treat that's packed with real vanilla and salted peanut butter flavor.
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Make the peanut butter swirl
Put the peanut butter, cream, invert sugar and salt into a bowl. Gently warm the mixture in a water bath or for 15 seconds in the microwave. Whisk until you get a smooth, glossy emulsion. Set it aside and let it cool completely to room temperature.
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Whip up the fluffy ice cream base
In a larger bowl, mix the mascarpone, invert sugar, icing sugar and vanilla together. Whip on low speed for 30 seconds. Pour in the ice-cold cream and increase the speed. Whip until you get a firm, thick cream. Be careful - as soon as it thickens, stop whipping so it doesn't curdle.
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Prepare the mould
Get a rectangular mould ready (such as a loaf tin lined with baking paper) or a glass container suitable for the freezer.