Butter a 1 to 1½ qt souffle dish; set aside. Combine half and half and flour. Bring to a boil; add butter; stir over heat until thick. Stir in cheese, salt and white pepper. Separately, beat eggs, stir in ½ cup cheese sauce. Pour this mixture into remaining cheese sauce. Separately, beat egg whites unti frothy; add cream of tartar, continue beating until mixture forms peaks. Fold into cheese sauce. Pour into prepared dish. Bake in preheated 350° oven for 30 to 35 minutes, or until puffed and golden.
NOTES : I heard a rumor that Samsø no longer exists; that it's now Danbø.