- Place wakame (if using) in hot water until rehydrated and tender, about 5 minutes. Drain and press dry. Rough chop and place in bowl with tuna.
- Combine cubed tuna, white onion, wakame (if using), and Poke Sauce mixture in a large bowl. Toss together until well combined.
- Transfer to serving bowl and garnish with green onions and sesame seeds.