Step 1

Melt the butter in a large pan or heatproof dish

Step 2

Add the onions and fry for 5 minutes until soft

Step 3

Add the pork and brown if using fresh

Step 4

Stir in the mushrooms

Step 5

Pour in the wine, add the paprika, stir and bring to a simmer

Step 6

Reduce the temperature and simmer for 2 minutes

Step 7

Add the soured cream, tomato puree and mustard, stir and cook for 15 minutes, stirring often, until the sauce has thickened

Step 8

Add a good pinch of fresh tarragon and black pepper and serve immediately