1. Prepare the marinade for the tuna: in a bowl, mix soy sauce, sesame oil, and peeled and grated ginger. Cut the tuna into cubes and place them in the marinade, mix well, and let marinate in the refrigerator for 30 minutes.
2. Meanwhile, cook the rinsed black rice in a large amount of water for 30 minutes. Drain and rinse.
3. Peel and grate the carrots, then drizzle them with rice vinegar and sesame oil, and sprinkle with sesame seeds.
4. Cut the avocado into cubes and squeeze the juice of 1/2 lime over it. Rinse and slice the lettuce.
5. Divide the following ingredients into 2 jars, in the following order: black rice, avocado, carrots, tuna, lettuce.
6. Prepare the sauce by mixing all the ingredients and serve it in a bowl.