Place the pistachios in a food processor and pulse into a fine, breadcrumb-like texture, scraping down the sides as needed, about 1 minute.

Add the powdered sugar and salt and blend again for 30 seconds.

While the food processor is running, slowly pour the oil until it is all incorporated and well blended into a creamy texture. Add more oil if you prefer a more runny consistency.

Transfer the pistachio cream to an airtight container, allow it to cool completely and then place in the fridge for up to 4 weeks. Makes about 1 ½ cups.