01 - In a large bowl, combine drained tuna, egg, celery, red onion, parsley, and lemon zest.
02 - Add breadcrumbs, mayonnaise, Dijon mustard, garlic powder, salt, and black pepper. Mix gently until well combined.
03 - Divide the mixture into 8 equal portions and shape each into a small patty.
04 - Heat olive oil in a large nonstick skillet over medium heat.
05 - Fry the tuna cakes in batches for 3–4 minutes per side, or until golden brown and crispy.
06 - Transfer to a paper towel-lined plate. Serve warm with lemon wedges or a light salad.