Tuna mayonnaise sandwich! A firm favourite of so many people. We pop celery, watercress and plenty of fresh lemon juice in our recipe to give lunch a cutting edge. Remember this filling can also be used in wraps, toasties and jacket potatoes too.
Finely dice the celery. Drain the tuna and scoop it into a bowl. Add the mayo and celery. Season with salt and plenty of pepper then combine. Add the lemon juice and zest, tasting to see if it needs any extra seasoning.
Spread the butter over one side of each bread slice. Pile the tuna mix onto the buttered side of two of the slices, add a pile of watercress, then sandwich with the other slices, butter side down. Slice into half and enjoy! Serves 2