- Pour 3 tablespoons of poke sauce over the tuna and allow to marinade in the fridge while you prepare the rest of the ingredients.
- To assemble, start with the cucumber and then stack a piece of tuna, a piece of avocado, and a piece of onion. Place a skewer through the stack for easy serving.
- Drizzle remaining tablespoon of poke sauce over the skewers and sprinkle with sesame seeds if desired.
- Serve cold.