Step 1

Put the shrimp and egg white in a food processor and pulse until pasty but still a little chunky. Add the sriracha, salt, sesame oil, black pepper, garlic, scallions and lemongrass and pulse until just combined.

Step 2

Divide the mixture among the bread slices and spread in an even layer to the edge. At this point, you can freeze the toasts while you heat the oil (although freezing is not totally necessary, it makes for cleaner cuts and easier handling).

Step 3

Bring 1 1/2 inches of oil to 350 degrees F in a heavy-bottomed pot.

Step 4

Cut each bread slice into 4 squares and sprinkle with the sesame seeds. Carefully place each piece shrimp-side down into the oil. Fry until golden, 2 to 3 minutes. Remove onto a rack or paper towel. Serve immediately drizzled with sriracha.