Four Cheese Sauce

Milk, water, single cream (milk), Grana Padano cheese (9%) (milk, preservative (egg lysozyme)), provolone cheese (milk) (6%), cornflour, pecorino cheese (ewe's milk) (2%), unsalted butter (milk), lemon juice, onion, mascarpone cheese (milk) (1%), wheat flour (wheat flour, calcium carbonate, iron, niacin, thiamin), salt, garlic purée, mustard seeds, spirit vinegar, white pepper, potato starch, ground bay leaf