Mix all ingredients except the neutral oil together then slowly drizzle the oil in to emulsify (a blender works best)
SALAD ASSEMBLY and INSTRUCTIONS:
Mix the sesame seeds and blackening spice together in a shallow dish
Roll the tuna in the mixture coating all sides
In a heavy bottomed fry pan, sear the tuna over medium high heat on all sides lightly, only about a minute per side then remove quickly to a plate to stop cooking.
Let tuna rest at least 5 minutes then thinly slice into bite-sized pieces
Toss remaining salad ingredients together )except for whatever crunchy topping you decide on) with dressing then top with tuna
Garnish with wasabi
Recipe by Dishin & Dishes at https://www.dishinanddishes.com/asian-ahi-tuna-salad/