Today I'm making what many people have called the best grilled cheese recipe in the world - Borough Market's famous Kappacasein Cheese Toastie. This legendary London cheese shop is known around the globe for their toasted cheese sandwiches, made with a mixture of Ogleshield raclette, Comte (a French Gruyere) and aged English cheddar cheese. But what makes it really unique is its filling of five different types of chopped onions. #QuarantineCooking #UltimateGrilledCheese #GrilledCheeseRecipeHow to Make Borough Market's Cheese Toastie at Home4 slices of good-quality sourdough bread8 ounces English Cheddar Cheese, grated8 ounces Comte (or Gruyere cheese), gratedOnion Mixture:1/4 cup diced leeks1/4 cup diced red onion1/4 cup diced green onions1/4 cup diced chives1 garlic clove, mincedButter, as neededButter sourdough slices from edge to edge. Mix shredded cheeses with diced onions. Pile a generous amount of the shredded onion-cheese mixture onto the non-buttered side of the bread. Slowly grill the sandwiches on both sides until crispy and golden, and the cheese has melted inside. STAY IN TOUCH!https://www.Facebook.com/ChefTipshttps://www.Instagram.com/ChefTipshttps://www.Twitter.com/ChefTips