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600 ml Foolproof vanilla custard, made with 5 egg yolks (1pt)
  Grated zest from one lemon
1 x Vanilla pod
55 gm Caster sugar, (2oz)
  A squeeze of lemon juice
5 x Egg whites
6 Tbsp. Caster sugar
1 tsp Cornflor
  Seeds from 1/2 vanilla pod