Prepare pan by greasing bottom and sides fully. In a medium bowl whisk together egg yolks, sugar, orange rind and juice, until it is thick and a pale creamy color. Gently fold egg whites into oat mixture, until it is incorporated. Spoon mixture into prepared pan. Core pears, leaving them whole, brush the insides with the lemon juice.
Place pears in the sauce pan, add the orange juice, rind and cinnamon stick.
Add enough cold water to almost cover the pears, making sure they remain standing. Let simmer for 20 minutes or until tender. Peel them, let cool before slicing. Stir occasionally until reduced to half. Brush pears and cake with glaze.