Mornay Cooking Sauce

Whole _Milk_ (34%), Water, Double _Cream_ (16%), Mature Cheddar _Cheese_ (4%), Cornflour, _Fish_ Stock (Water, _Fish_ Bones, Onions, Carrots, White Wine, Parsley, Thyme, Black Peppercorn), Unsalted _Butter_, White Wine, Sea salt, Onions, Lemon Juice, Chives, Dried _Mustard_, Ground White Pepper, Ground Nutmeg, Ground Turmeric