Roughly chop half of shrimp and finely chop the rest until it becomes a paste.
2. Step
Place the shrimp and tofu in a medium bowl and break up with a spatula. Add the mayonnaise, salt, and pepper. Mix well.
3. Step
Using your hands, form the shrimp mixture into 2 patties.
4. Step
Place the flour, eggs, and panko in 3 separate medium bowls. Dredge the shrimp patties in the flour, then egg, then panko bread crumbs.
5. Step
Heat the oil in a large pot until it reaches 350°F (180°C). Fry the shrimp patties until golden brown, then drain on paper towels.
6. Step
Line a ramekin with plastic wrap, and mold a quarter of the rice into a patty. Repeat with the remaining rice to make 4 "buns".
7. Step
In a medium nonstick skillet over medium-high heat, heat a splash of sesame oil, then add the rice buns. Cook, flipping once, until the outside is crispy.
8. Step
Make the tartar sauce: In a small bowl, combine the boiled egg, mayonnaise, pickles, and onions.
9. Step
Assemble the burgers: start with the rice “bun,” then add the green leaf lettuce, shrimp katsu burger, a dollop of tartar sauce, and top with another rice “bun.”
