Four Cheese Sauce

milk 41.0% , water 25.0% , single cream 19.7% , Grana Padano 9.0% , provolone 2.7% , corn flour 1.3% , Pecorino 0.7% , unsalted butter 0.3% , lemon juice 0.2% , onion 0.1% , mascarpone 0.0% , wheat flour 0.0% , salt 0.0% , garlic puree 0.0% , mustard seed 0.0% , spirit vinegar 0.0% , white pepper 0.0% , potato starch 0.0% , bay leaf 0.0%