01 - Combine heavy cream, milk, and half the sugar in a medium saucepan. Heat over medium heat until steaming, avoiding boiling.
02 - Whisk egg yolks, remaining sugar, and salt in a separate bowl until pale and thickened.
03 - Slowly pour 1/2 cup hot cream into yolks while whisking constantly to temper eggs.
04 - Gradually whisk tempered egg mixture back into saucepan.
05 - Cook over medium-low heat, stirring constantly with wooden spoon until custard coats spoon back (170-175°F).
06 - Remove from heat. Stir in peppermint extract, vanilla extract, and food coloring if using.
07 - Pour custard through fine mesh sieve into clean bowl. Cool to room temperature, then refrigerate minimum 4 hours until thoroughly chilled.
08 - Process chilled custard in ice cream maker following manufacturer instructions.
09 - Add chopped chocolate chips during final minutes of churning cycle.
10 - Transfer ice cream to lidded container. Freeze minimum 2 hours until firm before serving.