Add salt and pepper to the chicken fillet and bake in the oven until tender.
Cut the orange into two parts, set aside one half, it will come in handy later. Peel the other half of the orange, remove the segments and remove the films from them. Peel and dice the mango. Cut the onion into strips, and cut the chicken fillet into strips or small pieces.
In a large bowl, add the cooled rice, chicken fillet, oranges, mango and onion.
For the dressing, squeeze the juice from half an orange, add the juice of 1/4 lime or lemon (take a little less lemon), pour in soy sauce and olive oil. Mix everything well.
Pour the dressing over the salad and let it soak a little. Serve with lettuce or arugula leaves and sprinkle with roasted peanuts.