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Put the squash in a small saucepan and bring to the boil. Simmer for 5-6 mins until thickened and syrupy. Set aside to cool.
Separate the egg yolks and whites into two different bowls. Whisk the whites to firm peaks and gradually add the sugar until smooth and glossy. Beat the egg yolks until light and foamy.
In a 3rd, larger bowl, whip the cream with the vanilla seeds to firm peaks. Gently spoon the yolks and whites into the cream and fold until everything is combined.
Put 4 or 5 spoonfuls of the mixture into a bowl and combine well with the squash. Pour half the ice cream into a freezer container, with a lid, then drizzle over half of the squash mixture, swirl it through to create ripples. Repeat with the remaining ice cream and squash. Put the lid on and freeze until solid, approximately 6 hrs.