First we start with Peter Davison's milkshake recipe from the Doctor Who Cookbook (1986).
Probably more or less the same one that's in the special feature on the Earthshock DVD if what to watch Peter Davison try to make it.
Secondly we make it better with bananas. Bananas make everything better.
Then, oh and then we make it alcoholic.
Tumblr - [link]
+ scan of the original recipe.