1Begin by washing and slicing the leeks and parsnips into thin rounds.
Cut the chicken breast into bite-sized pieces.
In a large pot, bring the chicken stock to a gentle simmer over medium heat.
Add the sliced leeks and parsnips to the pot and cook for about 5 minutes until they start to soften.
Add the chicken pieces to the pot and continue to simmer for another 10 minutes.
Stir in the frozen broccoli and cook for an additional 5 minutes until the broccoli is tender.
Squeeze the juice of the lemon into the soup and stir well.
Season the soup with salt and pepper to taste.
Serve hot, garnished with fresh herbs if desired.