Step #1 Slice the pork fillets into 1cm wide strips & fry on medium high in 25g of the butter in a frying pan.
Step #2 Fry the pork for 2-3 mins & remove the semi-cooked pork & leave on a plate.
Step #3 Slice the onions & fry them in the butter with paprika for 3 mins.
Step #4 Add the garlic & sliced peppers & fry for a further 3 mins.
Step #5 Add the beer & turn the heat up high to reduce the liquid in the frying pan.
Step #6 Add the remaining butter & keep stirring to stop any sticking.
Step #7 Add the pork & continue to heat on high temperature.
Step #8 Add the sour cream, sliced parsley, salt pepper & yoghurt.
Step #9 Drop the temperature of the frying pan to a medium low & leave to reduce for 45-60 mins until sauce is rich & creamy, stirring every 10 mins to prevent sticking.
Step #10 Serve with plain boiled rice (as noodles do not soak up the juice as well).