For one toastie
The key ingredients in the Kappacasein toastie are Poilane sourdough and Montgomery’s Cheddar. You can buy Montgomery's Cheddar in our shops or online here, or substitute another mature, savoury cheddar. If Poilane is unavailable, substitute another sourdough bread with a close-textured crumb that will best contain the melting cheese.
100g of Poilane sourdough, sliced thin
Finely diced red onion
Finely diced white onion
Finely diced spring onion
Finely diced leeks
Heat a grill pan or frying pan over medium-high heat. Mix grated cheese with the finely diced alliums, adjusting amounts to your taste, then assemble the sandwich. Toast in the preheated pan without adding any oil or butter, the pan should be hot enough to toast the bread and allow the oils from the cheese to come through and prevent burning. The goal is to achieve a golden brown exterior without melting the cheese too much. If the sandwich is cooked at a lower temperature for longer, the cheese will liquify too much and it will result in a less concentrated flavour. It’s a delicate balance, like so many things in life!
Try one of Kappacasein's toasties for yourself on your next trip to Borough Market. For location and opening hours: www.kappacasein.com
Photo credit www.boroughmarket.org.uk