Prepare salmon sashimi by finely chopping or mincing into small pieces.
In a small container, combine minced salmon, chopped scallion, ponzu sauce, sesame seeds and enough sriracha to your liking.
Mix them good and set a side for 5 minutes.
Season sushi rice with sushi vinegar.
Lay a piece of nori over bamboo mat on a flat surface.
Spead seasoned rice all over nori.
Sprinle some roasted sesame seeds over the rice.
Flip the nori/rice sheet upside down.
Spoon salmon onto nori, then arrange cucumber slice.
Lift bamboo mat and carefully tuck then roll to create an inside-out sushi roll.
Now place the roll over cutting boad.
Use and small spoon/spatula to take some fish roes and spread over the outter side of the sushi roll.
You can mix and match to use diffrent kind of tobiko/masago to variate the flavor and appearances.
Once the roll is covered with enough fishes' roes, Lay a pieace of plastic wrap over the roll.
Then use bamboo mat to apple slight pressure to help with the roll shape and adhere fish roes to the rolls.
With the plastic wrap still cover the roll, use a sharpt knife to cut spicy salmon roll into bite-size slices.
Serve immediately with some soy sauce, wasabi and pickled ginger.