Step 1

First, combine the raspberries, cornstarch, and lemon juice in a saucepan. Cook over low heat, until the juices start to release. Stir occasionally, smashing the berries against the side to break them up. Once it starts to thicken, pull off the heat and strain through a wire mesh strainer (affiliate). Allow the mixture to cool to room temperature.

Step 2

Next, whisk or blend the butter, powdered sugar, vanilla, and raspberry sauce together until desired consistency.

Step 3

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