Mix the cake flour to a paste with the rum
and lemon juice; add this to the hot milk.
Cook, stirring constantly, until thickened.
(Season with vanilla essence, if desired.
Or if using the vanilla pod, remove it now.)
Cool this mixture to room temperature.
Beat the egg white to soft peaks. Continue
beating while adding the sugar. Beat to
stiff peaks.
Prepare the souffle dish(es) by brushing
the bottom and edges with melted butter.
Coat lightly with sugar. Preheat the oven
to 190 degrees C.
When ready to bake the souffles, fold the
beaten egg whites into the custard with
a few quick, light strokes.
Transfer the mixture to the prepared souffle
dishes. Set the dishes in shallow trays
or plates of water, and bake for 15-20 minutes.
Serve immediately, with ice cream and fruit
segments.