To make the potatoes, cook the potatoes in plenty of salted boiling water until tender.
Drain the potatoes, and return them to the pot.
Add the milk, cream, and 2 T of the butter.
Taste and add salt and pepper to your liking.
Divide the potatoes between two serving plates, and top with the remaining two T of butter (1 tablespoon on each plate).
Ladle the Coq Au Vin on top, and serve immediately with the rest of the wine.