Prepare the chicken by mixing egg whites, soy sauce, and cornstarch together
Season the mixture with salt and black pepper
Coat the chicken breasts with the egg white mixture
Heat neutral oil in a pan to 350°F (175°C)
Fry the coated chicken breasts until golden and cooked through
Remove chicken and set aside
Prepare the preserved lemon paste by cutting the lemon into rounds and removing the flesh
Make the lemon sauce by heating chicken stock with butter
Add minced garlic, sugar, turmeric, and toasted cumin seeds to the stock
Mix cornstarch with lemon juice and add to the sauce to thicken
Season the sauce with salt and black pepper
Slice the cooked chicken and arrange on a plate
Pour the lemon sauce over the chicken
Garnish with spring onion and cilantro leaves
Serve hot
From:
https://cooking.nytimes.com/recipes/1022656-double-lemon-chicken