Salt and pepper the shrimp and let stand while you make the batter.
Beat the egg whites until quite stiff. Beat in the cornstarch.
Put about 2 inches of oil into a heavy bottomed pan and heat until 375°F/190°C
Coat the shrimp in the egg white batter and fry until the batter is golden brown, about 2 - 3 minutes. Cook in batches to avoid overcrowding the pan.
Drain the cooked shrimp on paper towel.
When finished, stir the shrimp into the sauce to coat.
Transfer to a platter, garnish with the candied walnuts and cilantro.