Add 2 tbsp toasted white sesame seeds to a large dry pan.
Toast the sesame seeds over a medium-high heat until fragrant and slightly golden. Shake the pan regularly and remove from the heat as soon as they're done to prevent burning.
Grind the sesame seeds using a mortar and pestle until you have a fine powder.
Pour the ground sesame into a container and add 2 tbsp Japanese mayonnaise, 1 tsp rice vinegar, 1 ½ tsp sugar, 1 tsp Japanese soy sauce (koikuchi shoyu) and 1 tsp toasted sesame oil.
Mix until well combined and enjoy!
