Bechamel (white sauce). Many of our favourite meals need it. What would lasagna or moussaka be without it? If there is just one sauce you must master, then this is it.
Gently bring the milk to a simmer in a saucepan. Remove it and set it aside but keep it warm.
Start making the roux
Melt the butter (or in another saucepan), once melted remove from the heat add in the plain flour and stir continuously until paste forms – this is called a roux. Place this back on the heat and continue to cook for a minute or so stirring constantly.
Gradually add the warm milk to the roux bit by bit stirring as you go, until you get a smooth sauce.
Now cook for 5-10 mins, stirring continuously until the sauce has thickened. Season to taste.
Thermomix TM31 TM5 Method:
Place butter into the TM bowl and melt 3 min/100°C/speed 1.
Add flour and cook 3 min/100°C/speed 1.
Add milk, salt, pepper, place the simmering basket on top of the lid, then and cook 6 min/90°C/speed 3.5.
Thermomix TM6 Method:
Place butter into the TM bowl and melt 3 min/100°C/speed 1.
Weigh the remainder of the ingredients into the TM bowl, place the simmering basket on top of the lid and choose Thicken mode 100°C and let your TM6 do it's magic.
Notes
Take the pot off the heat when you're going to add ingredients, stir and combine well before popping it back on the heat.