Lemon And Vanilla Ice Cream
["2 c. half and half", "2/3 c. sugar", "1 vanilla bean, split lengthwise", "4 large egg yolks", "1/4 c. fresh lemon juice"]
["Combine half and half, 1/3 cup sugar and vanilla bean in medium saucepan. Scald. Scrape in vanilla bean seeds. Discard bean. In bowl, whisk egg yolks with remaining 1/3 cup sugar until doubled in volume. Gradually whisk in half and half mixture. Return to heat in saucepan and stir over medium heat until custard thickens, about 3 to 4 minutes. Do not boil. Transfer to bowl and chill. Before freezing, add lemon juice and pinch of salt. Process in ice cream freezer."]
["sugar", "vanilla bean", "egg yolks", "lemon juice"]