02. Combine ground pistachios with milk, cream, and salt; heat to a simmer. Temper the yolks and return to the pot.
03. Gently heat until thickened (don’t boil!). Transfer to a large bowl, and stir in vanilla and food coloring. Chill over an ice bath and refrigerate overnight.
04. Strain through a coarse sieve then a fine sieve; discard pistachios. Churn in an ice cream maker.