Bring a pot of water to a boil and add in the shelled pistachios. Let them cook for a few minutes, then take them off heat and drain away the water.
Place them on a kitchen towel and dab away all the excess moisture. Rub the pistachios well to remove the skin.
Separate the skin and set the cleaned pistachios aside.
Add the pistachios to a blender along with a splash of milk and some powdered sugar and blend until you get a smooth mixture.
In a pot over low heat, combine the pistachio paste with the remaining milk, butter and white chocolate and cook until the chocolate has melted.
Keep stirring and add more milk if needed, to adjust the consistency. Take it off heat, allow it to cool down and then use it to your liking.
Notes
Make sure you use a high speed blender to blend the pistachios. This will ensure it gets to that perfect silky smooth consistency you're looking for.
If you prefer the pastry cream to have that bit of chunkiness, with those crunchy bits of the nut, you can use a food processor to crush the peanuts until they're coarse, and then use them for the recipe.
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