Heat up the oil and add the onion and garlic once hot.
Fry for around 10 minutes until softened.
Add the mushrooms and fry for a further 5 minutes until softened.
Place the cooked onion, garlic and mushrooms in a food processor or blender along with all the other ingredients, and whizz until completely smooth - you might need to mix it around a few times.
Taste and adjust seasoning if necessary.
Enjoy immediately, or leave in the fridge for a few hours to firm up before serving.
Keeps covered in the fridge for a few days.
