Cut the pork loin into 6 equal slices, then sandwich each piece between two pieces of cling film and flatten with a meat mallet, rolling pin or the back of a saucepan.
Cut the shallot in half and peel it, then cut it into a dice as finely as you can.
Peel the garlic clove and then mash it to form a paste.
Slice the prunes.
Heat a 28cm (11") frying pan that is not non-stick over a high heat, and when it is hot, add the butter and oil.Season the pork tenderloin with the quarter teaspoon of salt, and when the butter begins to foam, add the pork and fry for 90 seconds on each side to get a nice golden colour, then remove and set aside.
Reduce the heat under the pan to medium and add the shallots and garlic, then saute for 60-90 seconds, ensuring that they do not begin to brown. If they do remove from the heat to cool the pan a little.
Add the brandy to the pan and reduce by half.
Pour in the chicken stock and the cream, and add the prunes, stir and simmer for 5 minutes. This is a good time to have a taste and add a pinch of salt if required.
Return the pork to the pan, spoon over a little of the sauce and allow to cook for 2 minutes to heat, then serve.