Combine Half-and-Half, brown sugar and corn syrup in a medium-size saucepan and
cook over medium heat, stirring constantly, until the sugar dissolves completely.
Remove from heat.
Beat egg yolks until creamy, then add 1/2 cup of the hot cream mixture, stirring
to heat them.
Put saucepan back on heat and add warmed yolks, stirring. Continue
to cook over medium-low heat until mixture coats the spoon.
Remove from heat, allow to cool, and stir in vanilla extract.
Chill and pour
into an ice cream maker, and freeze until partially set, about 20 minutes.
Stir in peanut brittle, and continue freezing until firm, following manufacturer's
directions.