Prepare the Salmon Mixture: Open the salmon cans and add the contents to a large bowl. Remove the pin bones if desired. Add the diced onion, eggs, and mayonnaise, and stir until well combined.
Add Dry Ingredients: Mix in the flour and cornmeal until the mixture is evenly combined.
Heat Oil: Heat oil in a cast iron or heavy-bottomed skillet over medium heat.
Form Patties: Use an ice cream scoop to portion the salmon mixture, ensuring uniform-sized patties. Flatten each scoop slightly.
Fry the Patties: Fry the patties in the heated oil until golden brown on both sides, flipping halfway through.
Finish and Serve: Lightly sprinkle with salt after removing from the skillet. Serve with your favorite dipping sauce. Optional: Add jalapeños to the mixture before frying for extra flavor.