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Heat oven to 200C/fan 180C/gas 6. Season the egg white. Dip the chicken in the egg, then in the coconut. Place on a lightly oiled baking sheet and bake for 20-25 mins, turning once until the chicken is cooked through.
Meanwhile, tip the cucumber slices into a colander, sprinkle with a little salt and leave for 5 mins to drain. Pat the cucumber slices dry with kitchen paper. In a bowl, mix the onion with the sugar and vinegar, then add the cucumber and serve with the chicken.