Put the chicken ... and coconut milk. Continue to cook over a high heat until the chicken is just cooked, about 1-2 minutes. Crush the chillies with a knife or Chinese chopper, add to the soup ...
Add half the curry paste (see tip). Stir well to coat the chicken and onions in the paste. Fry for 1–2 minutes, or until fragrant. Add the potato, chillies, stock, coconut milk, tomatoes ...
Cut the chicken breasts in half ... and add the ginger with the remaining Thai curry paste and fry for a minute. Sprinkle in the flour and blend in the coconut milk with the fish sauce and sugar ...