Preheat the oven to 200°C using the grill setting.
Fry the bacon until crispy (or to your liking) in a skillet or frying pan. (If you can multitask, do this step whilst making the cheese béchamel. Once done, place on a paper towel to drain off extra grease. For extra flavour, keep the rendered bacon fat in the skillet for the next step.
6 rashers bacon
Slice four slices of sourdough, each 1 ½ -2cm thick. Toast lightly in a toaster.(optional – for fresh soft sourdough this helps prevent a soggy sandwich)
4 slices sourdough bread
Spread a thin layer of mayo on both sidesof each slice of bread.
2 tbsp mayonnaise
To build the sandwich: (easiest to do this inthe skillet pan)Place your pan on medium heat. Add a smallknob of butter to the pan if desired. Lay a slice of bread in your skillet or frying pan. Sprinkle over a layer of grated cheese.
⅓ cup mature cheddar, grated
Top with several bacon rashers. Spoon over béchamel to cover and drizzle with harissa.
Top with another slice of sourdough and press down with a spatula to ensure good contact with the pan. Fry on medium heat until golden brown and gently flip with a spatula to brown the other side.
Once brown, flip sandwiches onto a non-stick or Silpat lined baking tray. Top with béchamel and grill for 5-10 minutes until browned. Watch closely to ensure it doesn’t burn.
While the bechamel is browning, heat up your skillet or frying pan with a drizzle of oil and a small knob of butter if desired. Crack in the eggs and fry until to your liking (I like a crispy sunny side up).
2 eggs
Top the grilled béchamel croque with fried egg. Drizzle with harissa and enjoy.