Cut each chicken breast into 4 pieces. Beat the
eggs, corn-flour and plain flour, adding just enough
water to make a thick batter.
Place the chicken
pieces in the batter and stir until thoroughly
coated. Heat the oil and deep-fry the chicken until
golden brown and cooked through.
Meanwhile, mix the stock, lemon juice, wine or
sherry, corn-flour and tomato puree and heat gently,
stirring, until the mixture comes to the boil.
Simmer gently, stirring continuously, until the
sauce thickens and clears. Arrange the chicken on a
warmed serving plate on a bed of lettuce leaves and
either pour over the sauce or serve it separately.