Italian Marsala egg custard with berries

Steps

1. 1

   Set up a gentle double boiler: the water should barely simmer and must not touch the bottom of the bowl.

2. 2

   Whisk the egg yolks with the sugar and lemon zest in a heatproof bowl until the mixture becomes pale.

3. 3

   Add the Marsala, set the bowl over the double boiler, and whisk constantly for 6 to 8 minutes, until the mixture is light, foamy, and visibly thickened.

4. 4

   Spoon into serving glasses right away and serve warm with the berries.