Place all ingredients except the oil into the Thermomix bowl and blend 10 seconds/speed 8.
Add the oil through hole in lid and blend 10 seconds/speed 6.
Store in airtight container in the fridge until use. Ideally you should use it within 3 days.
It is so easy to make that I don't recommend keeping it very long. You could freeze any leftovers and use in soups, stews or salad dressings.