Heat the olive oil in a frying pan over a high heat and add the chopped mushrooms.
Fry the mushrooms for 3-4 minutes until light golden, stirring once or twice.
Turn the heat down to medium and add the crushed garlic and cook for a minute.
Turn off the heat and remove the mushroom mixture to a plate or blender. Tip the olives into the frying pan for 30 seconds.
Tip the mushrooms and olives into a blender with the capers, red wine vinegar and parsley.
Pulse to get your desired tapenade consistency. I like to leave mine quite chunky, put you can make it finer.
Enjoy straight away, or keep in a covered container in the fridge.
Notes
Heating the olives helps release their flavour. You don't want to cook the olives, just heat them slightly.Anchovies: if you like anchovies, then add two to the blender with all the other ingredients.