Wash raisins and soak in cold water for 3 hours. Drain.
Combine the 2 cups water, the raisins, sugar and flour which have been mixed together, salt, lemon juice and rind, and the egg. Mix thoroughly and cook over hot water for 15 minutes, stirring occasionally.
Cool. Pour into pastry-lined pan. Cover with narrow strips of dough, crisscrossed.