Toast 3 slices of bread in a contact grill or dry frying pan over medium-high heat for 2-3 minutes until golden.
Fry 60 g bacon in a frying pan over medium-high heat for 5-7 minutes until crisp. Remove and set aside.
In the same frying pan over medium heat, fry 1 egg for 2 minutes on the first side. Pierce the yolk with a fork, flip, and fry for another 1-2 minutes on the second side until set. Remove from heat.
Slice the 60 g chicken fillet into thin layers. Grill or pan-fry over medium-high heat for 2-3 minutes per side until fully cooked (internal temperature 74°C / 165°F).
Slice the pickled cucumber into thin rounds.
Mix 1 tablespoon mayonnaise with 2 teaspoons kimchi base in a small bowl to make the greasing sauce.
Mix 1 tablespoon mayonnaise with 1 tablespoon granular mustard in a small bowl to make the serving sauce.
Spread greasing sauce on the first slice of toasted bread. Layer with a lettuce leaf, the grilled chicken slices, 1 piece of processed cheese, the cucumber slices, and the fried egg.
Spread greasing sauce on the second slice of toasted bread and place it greased-side down on top of the first layer, pressing gently.
Layer a lettuce leaf, the crispy bacon, and the remaining piece of processed cheese on top of the second bread slice.
Spread greasing sauce on the third slice of toasted bread and place it on top to close the sandwich, greased-side down.
Cut the club sandwich diagonally into 4 triangle portions and serve with the serving sauce on the side.
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