Heat a cast-iron pan and in the meantime, chop bacon into strips. Add bacon to hot pan and cook until crispy. DO NOT throw away the bacon fat, you will use this in the dressing.
In a medium bowl, toss the couscous and walnuts together. Reserve.
In a small bowl, whisk together the bacon fat and lemon juice. Season with salt.
Dress the couscous and add Marash pepper to taste.
Serve in individual glasses with an extra wedge of lemon, top with more walnuts and bacon and enjoy!