Generously season the tuna with salt and allow to sit for 10 minutes. Gently rinse and dry the tuna.
Combine the tuna with the lime juice, sesame oil, soy sauce, ginger, olives, and green onions and allow to marinate for 10 minutes. Adjust seasoning with lime juice, salt, and pepper, as needed.
Combine the roasted sliced potatoes with the red cabbage,