. 1 ½ kg chicken pieces
. 3 tbsp lemon juice
. 1 tbsp grated lemon zests
. 1 onion (chopped)
. ¼ celery (chopped)
. 1 teaspoon fresh thyme
. ¾ cup chicken stock
. 2 tbsp butter
. 3 tbsp flour
.Black pepper
.Lemon slices for garnish

. Marinade chicken pieces with 2 tbsp lemon juice for 30 minutes
. In a saucepan, put marinade chicken pieces with lemon juice, add the remaining lemon juice, salt, Blackpepper, chopped onion, celery, thyme, and chicken stock. Cook for 10 minutes
. Remove chicken from the sauce, and place on a serving plate.
. Strain cooking sauce, drain off fat and reserve
. Melt butter in saucepan, sprinkle in flour and cook on low heat by stirring frequently with a handy whisk, for 3 minutes
.remove from heat, keep stirring, gradually add cooking reserved sauce to the mixture and return the mixture on medium heat once again.
.cook until the mixture become thick
. Pour sauce over chicken, garnish with lemon slices and serve hot