Gradually stir in enough white flour to form a soft but not sticky dough.
Remove from the heat and gradually stir in the milk.
Gradually stir in enough water to make dough come together when pressed.
Gradually stir in the rest of the remaining flour.
Gradually stir in the milk to make a batter.
Gradually stir in remaining milk along with cream and sugar.
Gradually stir in the remaining 2 tablespoons of oil and the hot water, as if making mayonnaise.
Stir in the cream gradually and bring up to bubbling again.
Gradually stir them into the warm (but not hot) chocolate.
Gradually stir in cider or stock, until thick and smooth.