Blanch the frozen vegetables in salted water or in broth. Clean the fresh vegetables, wash them, cut them into small pieces and cook until they are firm to the bite.
Then drain and drain.
Bring the vegetable stock to the boil and add the milk, cheese and herb butter. Season to taste with salt, pepper, nutmeg and lemon juice. Tie as desired with a sauce thickener.
Either pour it over the vegetables or carefully add and mix into the sauce.