For the sauce, put the lemon juice, sugar and water in a small saucepan. Put over a low heat and bring to a gentle simmer. Stir until the sugar has dissolved. In a small cup, mix the cornflour with one tablespoon of water. Stir until combined, then tip into the saucepan, stirring the lemon mix constantly. It should thicken immediately. Add a pinch of salt and turn off the heat.
Put the rice in a large pan of boiling water. Boil for 15 minutes, or until cooked. Add the peas for the last 30 seconds. Drain.
Preheat the oven to 200 degrees Celsius. Crack the eggs into a bowl. Add a pinch of salt and pepper, whisk.
Put the plain flour and cornflour onto a large plate. Use your fingers to gently mix the two together.
Line up the egg bowl, flour plate and another empty plate. One by one, dunk the pieces of chicken in the egg mix then cover with flour on the flour plate. Put onto the empty plate.
When all of the chicken is coated, get a large saucepan and fill it with about 2 inches of vegetable oil. Put on a medium heat.
When hot, add the chicken - starting with any bigger pieces - about 6 pieces at a time. Fry for five minutes, turning regularly, then drain on kitchen roll. Transfer the cooked chicken pieces to a baking tray and keep in the oven to stay warm while you cook the rest. Continue with the rest of the chicken.
When you are ready to serve, pile the rice and peas into bowls. Reheat the lemon sauce, then tip the chicken pieces into it, toss and add to the bowls. Serve immediately.