Place the eggs in a saucepan of warm water and slowly bring to the boil. Simmer for 7-8 minutes. Drain and cool in cold water. Peel and halve.
Meanwhile, trim the tops from the beans. Heat the oil in a wok. Stir-fry the beans, until crisp-tender and lightly browned. Drain on paper towels and cool.
Sprinkle the lemon juice over the avocado to prevent browning. Combine the prawns with 2-3 tablespoons of the dressing.
Layer the ingredients on 2 serving plates. Drizzle with the remaining dressing.