Start by placing the chopped chicken thighs in a bowl then add 2 tbsps of cornflour. Toss together so the chicken is coated completely.
Now make the batter for the chicken. In a large bowl, add the plain flour, egg, salt, pepper and water then mix using a whisk until smooth.
Add the chicken to the batter and mix so the chicken is fully coated.
Add the oil to a large frying pan and heat over a medium-high heat until hot.
When the oil is hot, add the chicken to the oil one piece at a time, and cook for 8-10 minutes, turning over half way through, until golden brown and cooked throughout. You might need to do this in batches.
Once cooked, place the chicken onto kitchen paper to get rid of any excess oil.
To make the orange sauce. In a jug, mix together the juice of 2 oranges and the zest of 1, caster sugar, soy sauce, garlic, ginger and vinegar.
Pour the sauce into clean pan and bring it to the boil, once boiling turn it down to a simmer and cook for a minute.
Meanwhile, mix 2 tbsps of cornflour with 4 tbsps of cold water to make a slurry, pour it into the sauce and stir until it thickens. Turn the heat down.
Add the chicken into the sauce and stir to coat it. If the sauce it too thick, add a splash of hot water.
Serve it with rice, a sprinkle of sesame seeds and some spring onions.