Heat the oil in a frying pan over high heat until very hot. Add the meat and fry in batches for 3-5 minutes, stirring continuously until lightly browned. Remove from the pan, set aside and keep warm.
Melt the butter in the pan, add the shallots and cook for 2 minutes or until soft but not coloured. Stir in the paprika for 45 seconds, then add the mushrooms and coo