Place the chicken in a medium pot and cover it with water. Add the lemon and dill in the pot and cook the meat for around 10 minutes on a medium heat. Take the pot out of the heat and leave the meat side to chill.
3 chicken breasts, 6 slices lemon
When the meat is cold enough to touch it with your hands, place it on a chopping board and cut it into small cubes. You can also cut the apple, onion and celery. Place all these ingredients in a big bowl and pour over the dressing and stir with a spoon until everything is covered with the dressing.
1 green apple, 1/2 red onion, 2 celery stalks
Make the dressing:
In a medium bowl, whisk together the mayonnaise, Dijon mustard and vinegar and season with salt, pepper and 1 tbsp chopped dill.
A few sprigs dill + 1 tbsp chopped, 5.3 oz 2/3 cup mayonnaise, 2 oz 1/4 cup Dijon mustard, 2 tbsp red wine vinegar, kosher salt, freshly ground black pepper
Assemble the sandwich:
Cut the baguette bread into the wanted sized pieces. Cut every piece in half. Lay a lettuce leaf on the bottom part of the bread, add a spoon or two of the chicken salad you’ve already made and top it with the other piece of the bread assembling if needed.