Roast Beef with Beetroot Demi-glaze

• beef eye fillets
  watercress or rocket to serve

Beet root Demiglaze  I made the demigazed then add to the beef pan once the beef was cooked and baked the beetroots in it for a further 15 to 20 minutes

2 bunches beetroots

40g butter

2 tbs olive oil

onion
4 slices pancetta or bacon rashers

• 1carrots
• 1 stalk celery
• 2 sprigs thyme and parsley
• 2 bay leaves
• 2 large mushrooms
• 4 cups beef stock
• 1 teaspoon Vegemite
• 2 teaspoons brown sugar
• 2 tablspn plain flour (this was too much!!!!)
  1cup dry sherry (red wine or balsamic vinegar)