Poke
Dice the sashimi-grade tuna into cubes.
Slice avocado, cucumber, and onion into bite-sized pieces.
Place the tuna, avocado, cucumber, and onion in a bowl.
Mix soy sauce, sesame oil, lemon juice, honey, and minced garlic to make the sauce.
Add the sauce to the ingredients and mix well.
Place the mixture over rice and sprinkle with seaweed flakes and sesame seeds.