heat the oil and butter in the frying pan
fry the shallots until softened, but not browned
add a few pork medallions to the hot pan and fry for 2 – 3 minutes each side
lift out and keep hot,
continue until they are all cooked
remove the pan from the heat and de–glaze the pan with the white wine
add the cream and mustard, stir well
re-heat until the sauce bubbles and thickens slightly
put the medallions back into the sauce
adjust seasoning with pepper en salt