Whisk together the egg yolks, sugar and vanilla sugar. Bring the milk, cream, glucose syrup and cinnamon to the boil. Beat the egg mixture into the warm milk mixture. Strain through a fine-meshed sieve. Process the mixture in an ice cream machine or leave it in the freezer for at least 5 hours, stirring occasionally.
Put the chopped rhubarb, strawberry cordial, lemon juice and icing sugar in a pan and boil until the rhubarb is soft. Stir in the vanilla sugar. Mix the potato starch with a little water and stir into the compote to thicken it. Serve lukewarm or cold with the ice cream.
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