For 4 servings:
600g beef fillet, preferably from the tail or head, cut into 1/2 inch cubes
300g potatoes, peeled and diced to 1 x 1cm, pan-fried
250g button mushrooms, sliced
50g shallots, diced
2 tbsp butter, unsalted
2 tbsp olive oil
2 tbsp sour cream
2 tbsp cognac
1 tbsp mustard
1 tbsp tomato ketchup
5 no. gherkins, julienned
5 slices beetroot, julienned
100ml Demi Glace (brown sauce)
Sea salt, freshly cracked black pepper and paprika