01 - 
                Boil shelled pistachios for 1–2 minutes. Drain and immediately transfer to cold water. Rub between fingers or a towel to remove skins.
              
              
              
                02 - 
                Preheat oven to 175°C (350°F). Roast peeled pistachios for 5–7 minutes until fragrant. Avoid over-roasting.
              
              
              
                03 - 
                In a food processor, blend pistachios with sugar until a smooth paste forms. Scrape down the sides frequently.
              
              
              
                04 - 
                Over low heat in a saucepan, melt butter and white chocolate. Gradually add milk while stirring. Incorporate pistachio paste and cook for 3–4 minutes until thickened.