Bring the water with the herbs to a boil. Add some salt as needed.
Stir in the polenta and let it well up for about 10 minutes, stirring regularly. In the meantime oil a baking pan. Fill in the ready polenta, wet your hand with cold water and smooth the surface.
Let it cool down and keep in the fridge. Cut in pieces use it with the other food components
I prepare the polenta for some days in advance and keep them in the fridge.