Potato, cheese and onion are, for me, the Holy Trinity of flavours. Think Cheese and Onion Crisps (Walkers obviously), they are the best flavour by a mile. Sour Cream & Chives Pringles. Jacket potato with cheese, sour cream and chives (a la Spud -U-Like) the classic, original & best topping. And, of course, the Potato, Cheese and Onion Pie. I thought the contrast between the soft fluffy centre and a nutty, flaky crust.