Place water and salt into Thermomix bowl and boil 8 min/100ºC/speed 3.
Preheat oven to 200ºC.
Add polenta and cook 10 min/100ºC/speed 4. Add taleggio and butter through hole in lid and blend 30 sec/speed 4.
Pour or spread mixture into a buttered shallow pie dish. Sprinkle the cheddar over the top and a good grinding of black pepper. Bake 25 minutes until golden and bubbling. If you have a grill in your oven fire it up and brown the top for around 5-7 minutes at 250ºC.
I served it with roasted red pepper strips, (homemade of course).
Serve hot or cold as a side dish. (But best hot and sizzling!)