First make the prawn (shrimp) balls. Combine all the
ingredients in a mixing bowl. Using your hands,
shape the mixture into small, walnut-sized balls.
Toss gently in the cornstarch.
Fill
a large saucepan about one-third full with vegetable
oil and heat it until it is very hot. Carefully
lower the prawn (shrimp) balls, a few a time, into
the hot oil and fry until they are golden brown and
crisp. Remove from the oil and drain on kitchen
towels. Set aside.
Heat
the peanut oil in a large frying-pan. When it is
hot, add the ginger and stir-fry for 1 minute. Add
the vinegar, soy sauce, tomato paste, sugar and
stock and stir until they are well blended.
Stir
into the peas and bring to the boil. Return the
prawn (shrimp) balls to the pan and stir-fry for 2
minutes.
Stir
in the cornstarch mixture and cook until the sauce
thickens and becomes translucent. Transfer the
mixture to a warmed serving dish and serve at once.