Add butter to the Thermomix bowl. Melt for 2 minutes / 60 degrees / speed 2.
Add the remaining ingredients and mix for 20 seconds / speed 4.
Set aside to rest for one hour.
Before you start making the crepes, fill a saucepan with boiling water and place a plate over the top (you don't need to have heat on under the pan). This is to keep the crepes warm until they are ready to serve.
When you are ready to cook the crepes, heat a medium sized frying pan over a medium heat and melt a little butter. Once it is bubbling, use a piece of kitchen paper to wipe around the pan so that the butter is just glistening the surface of the pan.
Now pour around ⅓ of a ladle of batter into the centre of the pan and immediately tilt the pan to one side to allow the batter to fill that side of the pan. Next tilt the pan towards the other side in a circular motion to fill the whole of the bottom of the pan.
Wait until the surface is no longer shiny and the edges are starting to brown. This should take around a minute.
Use a spatula to lift up the edge and then either use the spatula or your fingers to flip the crepe over (or toss it up in the air if you dare!)
Cook the other side for a further minute. It should have brown patches but not be burned!
Stack the crepes on the plate over the pan of hot water until you are ready to serve.