Spicy Tuna Poke

For two servings: - 8oz Seared ahi tuna, cubed (Two large steaks) - 1tsp Togarashi Shichimi (Or more for desired spiciness) - 1tbsp Siracha (Or more for desired spiciness) - 1tbsp Soy sauce (Tamari for GF) - 1tsp Sugar - 1tsp Rice Vinegar - 1/2 Tsp Yuzu kosho - Stems of two green onion, minced (Optional, use tops for garnish)