
Use a pestle and mortar to crush and grind the toasted sesame seeds. It is fine to have some intact seeds here and there.
Add sesame seeds, mayonnaise, rice vinegar, soy sauce and honey to a mixing bowl. Stir to combine. Drizzle in sesame oil and stir to combine.
Taste the dressing and adjust to your liking. Once you are happy with how it tastes, check the consistency. If it is too thick, you can add in just a bit of water (1/2 - 1 teaspoon) to adjust the consistency.