01 - In a large bowl, combine tuna, breadcrumbs, green onions, red bell pepper, egg, mayonnaise, Sriracha, lime juice, Dijon mustard, garlic powder, smoked paprika, salt, pepper, and cilantro. Mix until well combined.
02 - Divide the mixture into 8 equal portions and shape each into a patty about 2.5 inches wide.
03 - Heat vegetable oil in a large nonstick skillet over medium heat. Add the tuna cakes in batches and cook for 4-5 minutes per side, or until golden brown and heated through. Transfer to a paper towel-lined plate.
04 - For the Sriracha mayo, whisk together mayonnaise, Sriracha, and lime juice in a small bowl until smooth.
05 - Serve the tuna cakes hot, drizzled with Sriracha mayo or with the sauce on the side for dipping.