Toast pistachios for 5 minutes in an oven at 180 degrees Celsius.
Once cooled, grind pistachios in a food processor.
Melt white chocolate and add it to the food processor.
Grind the mixture to a fine paste, adding milk as needed.
In a heavy bottom saucepan, add 500 ML milk and pistachio paste.
Add cream, sucrose, dextrose, whole milk powder, and cornstarch.
Blend dry ingredients into a fine powder.
Combine dry and wet ingredients.
Heat the mixture to around 85-90 degrees Celsius, then cool down.
Blend if required to smoothen the mixture.
Cover and refrigerate overnight to mature.
Churn in an ice cream/gelato maker the next day.
Freeze the soft serve mix in a pre-frozen container at the lowest temperature.
Once frozen solid, increase the temperature to -17 or -18 degrees.