What is a rollmop? Someone said they put it on jacket potatoes?

Question

On the same subject. What is the difference between a baked and a jacket potato?

Answer 1

Delicious herring soused in vinegar ! On a tattie ? Sacrilege !  

Answer 2

Baked Potato (USA) = jacket potato (UK)

No idea what rollmop is.... the usual toppings here (USA) are butter, sour cream, cheddar cheese shreds, cooked bacon bits, chopped chives or green (spring) onions

Answer 3

I think it is a herring which is a type of fish.

I think you can buy jars of roll mop herrings.