Lemon and Orange Gelato

2 cups milk
2 tablespoons orange and lemon zest
5 egg yolks
3/4 cup sugar
4 tablespoons lemon juice

Scald the milk with the orange and lemon zest in a medium saucepan. Whisk the egg yolks and sugar to blend. Gradually whisk half of the hot milk into the yolks. Return the yolks to the saucepan with remaining milk. Stir over low heat until custard thickens and leave a path on the back of the spoon when you draw your finger across it. Do not let the mixture boil.

Transfer the mixture to a large bowl and chill.

Once the mixture is cool stir in the lemon juice.

Transfer to ice cream maker and process according to manufacturers instructions.