This classic tuna melt can be made in a frying pan! If you like a little more texture to your toastie, it also works well with a tablespoon of finely diced celery folded through the filling.

Line a baking sheet with parchment paper. In a medium bowl, mix drained tuna, chopped fennel, pickled jalapeños, lemon juice, mayonnaise and chopped parsley until well combined. Season with salt ...