Fettucine alfredo

Here is my recipe for my favorite PASTA

• 227g tub clotted cream
• 25g butter
  
   (about 2 tbsp)
• 1 tsp cornflour
• 100g parmesan
  
  , grated
• freshly grated nutmeg
  
• 250g fresh fettuccine or tagliatelle
• snipped chives or chopped parsley, to serve (optional)