Make a simple roux sauce in a pan with butter, milk and flour.
Crumble in a generous handful (or two) of Caerphilly Cheese.
Sautée your chopped leeks in a knob of butter till soft.
Add your cheesy roux and stir.
Top with an extra crumbling of Caerphilly and grill for extra indulgence.
Nice and quick, nice and easy.
Watch out - most is eaten before it leaves the pan.
Find your leeks out in the Fruit and Veg Market stalls and your Caerphilly at the Cheese counter. Enjoy!