Mushroom Sauce for Steak

This goes really well over steak, and the secret ingredient is an Aussie favourite! I am posting as written, but do not add salt, I added pepper and just a little extra water, you may need to thin this down if you prefer but you may not need it.... I just wanted it a bit runnier.

• Ready In: 20 mins
• Serves: 4

Ingredients

• 3  tablespoons butter
• 1  onion, large, sliced thinly
• 2  cups mushrooms, sliced
• 2  teaspoons cornflour
• 1  cup water
• 2  teaspoons vegemite
• 2  tablespoons tomato sauce
• 2  teaspoons Worcestershire sauce
• 2  teaspoons grainy mustard

Directions

1. Heat the butter in a pan and saute the onion for 5 minutes or until onion's are soft. Add the mushrooms and cook a further 2 minutes. Blend the cornflour with a little of the water and add to the pan with remaining water, Vegemite, sauces and mustard. Stir over a medium heat until the sauce thickens.
2. Pour over steaks for serving.