Spicy Tuna

Bahan-bahan (2 porsi)

• 4 oz sashimi-grade tuna
• 2 g reen onions/scallions
• ½ tsp toasted sesame oil
• 1½ Tbsp sriracha sauce ((for the tuna; reduce for less spicy; plus 1 tsp more for the optional spicy mayo))
• 1 Tbsp Japanese Kewpie mayonnaise
• 1 tsp toasted white sesame seeds ((for garnish))