Wash and dry the lettuce leaves. Wash the tomatoes and cut into quarters. Boil the eggs and cut in half. Peel the avocado and cut the pulp into thin pieces. Clean the langoustines, remove the intestines, leave only the tails, rinse them and dry them.
In a preheated frying pan with oil, fry the tails for 1.5 minutes on each side, place on a paper napkin to absorb excess fat.
In a separate bowl, mix olive oil with salt, pepper and vinegar.
Place arugula leaves and lettuce in a serving plate, top with tomato slices, then sliced avocado, halved eggs and fried langoustines. Pour the prepared dressing over the salad and serve immediately.
To give the salad a spicy note, add mango and chili pepper. Add soy and nut sauce to the dressing.