What are your three sauces? Ketchup, brown and tartare? I considered ketchup but I only ever have it on burgers or hotdogs and I didn't think it'd go with fish fingers for me. I don't like brown sauce so it was either salad cream or tartare sauce.
I baked five fish fingers (4 for me and 1 for the dog), lightly buttered my roll then spread a dollop of tartare sauce on, salt and vinegar'd my fish fingers while they were still on the baking tray then put them on the roll and put another dollop of tartare sauce on top of them, cut the roll in half then inhaled it and wished I'd made two. After I'd eaten it I ate half of the dog's fish finger too before dropping his half in his dish.