Cold potato, thick mayo and gherkins, gurt lush!
Yes cheese sandwich is prob my go to. Nowdays mostly in my panini toaster.
I do love marmite & cottage cheese on toast - as my ultimate Umami breakfast or late snack
But will pass on a potato sandwich - although I love potatoes (except boiled)
I do like to toast a cheese and pickle sandwich, it has to be the small chunk pickle. I bought a George Formby machine, that makes a nice job of it. Not sure about cottage cheese, the texture just looks wrong. I like marmite just on buttered crumpets.