Combine egg and 1 tablespoon water in a small bowl. Use a pastry brush to spread the egg wash over the spring roll wrappers.

Place a sheet of nori on top of each wrapper and brush the nori with the egg wash. Sprinkle with sesame seeds and rest for 10 minutes.

Pour oil into a Dutch oven. Warm the oil to 300° over medium heat.

Cut each nori-topped wrapper into 9 squares.

Working in batches, place several crackers in the hot oil and fry until browned and crispy, about 5 minutes.

Transfer crackers to a paper towel–lined plate, then season with salt.