In a saucepan, lightly beat the egg yolks with 1/3 cup sugar and 1 teaspoon of all purpose flour.
In another saucepan, heat the milk and vanilla bean (make a slit on its side and free the seeds into the milk). Let it heat until very hot but not boiling. Slowly, in a very thin stream, add the hot milk into the yolk mixture, emulsifying with a whisk until it is all incorporated. Place over low heat and stir until the sauce almost reaches a boil, and coats the back of a wooden spoon. Turn the heat off and keep on whisking slowly, for about a minute or so. The sauce can be served hot, warm or cold. It can be stored in the refrigerator for up to a month once cooled.
Once the molds have cooled to room temperature, you can unmold them. Use a knife to go around the edge of the molds and carefully turn them onto a plate. Drizzle the caramel from the bottom of the molds on top of the islands. Add a couple tablespoons of the vanilla sauce on top. You may garnish with strawberries or any other fruit of your liking.
Islands can be refrigerated in their molds, covered, for up to 4 days.