Vanilla Cream and Cherry Gratin

For the vanilla cream: slit vanilla pod lengthwise, scrape out seeds and add both to milk. Bring to a boil.  Remove from heat and let cool slightly. Beat yolks with sugar in a bowl until creamy. Add cornstarch and mix well. Gradually add warm milk, stirring. Return mixture to the pot, remove vanilla pod and simmer, stirring, on low heat until cream thickens, do not  boil. Pour vanilla cream into ovenproof serving ramekins.