I got this recipe from Paula's Cooking on Food Network. We made them yesterday for the Forth of July, and I had to print out recipes for everyone as they were leaving!!! Even the beef eaters liked these!
In a large bowl, combine the tuna, bread crumbs, and egg, and stir lightly.
Add the onion, celery, pimento (if using), lemon juice, horseradish, garlic, and pepper, and mix again.
Form the mixture into 4 patties. Heat the oil in a nonstick skillet over medium heat and cook the patties, covered, until golden brown. (We began cooking on the grill and finished in the oven). Carefully flip the patties and cook the other side for 5 minutes.