Add the cilantro stems, the whites from the green onions, garlic, shrimp, egg white, cornstarch, fish sauce and salt to the bowl of a food processor.
1
Blend shrimp paste
Pulse the shrimp paste until ground but not smooth - you should still be able to see some pieces of the shrimp.
2
Prep the bread
Trim the crusts off the Japanese milk bread or white bread.
3
Add shrimp paste
Mound about 2 tbsp of the shrimp egg paste high in the center of each slice of bread and spread it evenly to corners with a spoon or rubber spatula.
4
Dip in sesame seeds
Add sesame seeds to a shallow dish or plate and spread out. Dip each slice of the shrimp-topped toast, shrimp-side down onto the sesame seeds.
5
Heat oil
Fill a large cast iron pan or Dutch oven with enough oil to reach 1” up the side of the pan. Heat the oil to 350ºF (177ºC).
6
Fry the shrimp toasts
Working with two slices of bread at a time place bread, shrimp-side down, into the hot oil. Fry until light gold in color, about 3 min. Flip and fry and additional 2 min
7
Cut the shrimp toasts
Cut each slice on the diagonal to create 4 equal triangles. Repeat with the remaining ingredients until all have been fried.
8
Serve
Arrange shrimp toasts on a platter and top with the remaining green onions, sliced on the bias. Serve on their own or drizzled with sriracha and mayonnaise.