First cook the rice in salted water and cook the chicken breast as well. The peas are briefly blanched, drained and quenched with cold water. Cut the peppers and cucumber into small cubes.
Peel the avocado, cut into fine strips and drizzle with 1 tablespoon of lemon juice. The chicken breast is also cut into strips or cubes.
Mix the rice, bell pepper, cucumber, peas, avocado and chicken breast well. For the dressing, whisk the oil with the lemon juice, vinegar, soy sauce, salt, pepper and sugar and mix well with the salad. Season again to taste and, if you want, let something go through.