here is the recipe for it, make it at home, its easy, tried it last week and it tasted just like it!! Enjoy :)
Panda Express Mandarin Chicken
2/3 cup sugar
1/4 cup soy sauce
1 tablespoon lemon juice
1 teaspoon vegetable oil
1 teaspoon minced fresh garlic
1/2 teaspoon minced fresh ginger
1/4 cup water
1 tablespoon cornstarch
6 skinless chicken thigh fillets
Combine sugar, soy sauce, lemon juice, oil, garlic and ginger in a small saucepan.
Combine water with cornstarch in a small bowl and stir until cornstarch is dissolved. Add to saucepan and turn heat to high. Stir often while bringing mixture to a boil, then reduce heat and simmer for 4 to 6 minutes or until sauce is thick.
Preheat your grill on high for the chicken.
When the grill is hot, rub each chicken piece with oil and cook the chicken for 4 to 6 minutes per side or until done. Chicken should have browned in spots. When chicken is done, chop it into bite-size pieces.
Pour the chicken pieces into a large frying pan over medium heat. Heat until chicken sizzles then reduce heat and cover chicken until ready to serve.
Spoon chicken into a medium bowl, then pour all the sauce over the chicken and stir until well-coated. Serve with steamed white rice.