Place the rice in boiling salted water and let it boil until the rice grains crack open (approx. 60 minutes). Drain and chill the wild rice, add a little oil and let it dry in a slightly preheated oven.
Mix the cooked wild rice with the eggs, celery, green pepper, onion, tomatoes and cucumber. Season the mayonnaise with salt, pepper and mustard and fold gently into the rice mixture. Serve the wild rice salad on crunchy lettuce leaves.
Mix wild rice into any salad or garnish green salads with cold wild rice grains.