Beat eggs and sugar together with a mixer for 5 to 7 minutes at medium speed

Add butter and vanilla, beat a further 2 minutes

Add milk, salt, flour and cranberries and mix with a spoon

Pour batter into a floured 9x13 or 10 spring-form pan, top with Demerara sugar

Bake at 350 for 60 minutes (until cake tests clean)

To freeze, let cool completely then wrap in parchment paper then aluminum foil.

Let thaw at room temperature then serve with butter, or frost with buttercream or fluffy white frosting.