You can use this seared tuna recipe for tuna poke!
Set the EGG for direct cooking to 500°F/260°C. Mix soy sauce and cornstarch until smooth. Add pineapple juice, honey and sriracha. Place pot on stove over medium heat and bring to a boil. Reduce heat and simmer 3-4 minutes until the thickened. Remove from heat.
Heat Big Green Egg Cast Iron Skillet and add oil. Sear tuna steaks 1-2 minutes, brushing each side with sauce mixture after searing. Garnish with sesame seeds.