1 Cup Milk
1/2 Onion, Sliced
1 Bay Leaf
1 Tablespoon Plain Flour
Put milk, onion, bay leaf and peppercorns in a small saucepan and bring to the boil. Remove from heat and leave to infuse for 10mins. Strain milk discarding flavors. Melt butter in a pan and stir in flour, cook stirring for 1 minute until mixture is golden and bubbling. Remove from the heat and gradually add in milk, stirring until smooth. Return to the heat and stir until mixture boils, continue cooking until sauce gets thick, remove from heat and season.
Note: To make cheese sauce just ass 1 Cup Cheese.