Mexican Chocolate Ice Cream

Preparation

1. Step 1

   Halve vanilla bean lengthwise and scrape seeds into a 3-quart heavy saucepan. Add chocolate and half-and-half and bring to a boil over moderate heat, whisking. Remove from heat.

   Step 2

   Lightly beat eggs with salt in a bowl, then add hot chocolate mixture in a slow stream, whisking. Transfer custard to cleaned saucepan and cook over moderately low heat, stirring constantly with a wooden spoon, until custard registers 175°F on thermometer, 1 to 5 minutes. Immediately pour through a fine-mesh sieve into a metal bowl. Put bowl in a larger bowl of ice and cold water and cool, stirring occasionally.

   Step 3

   Freeze custard in ice cream maker. Transfer ice cream to an airtight container and freeze until hardened, about 1 hour.