This can be a main or a side, and you can vary the dressing (I was lazy this last time and just used a store bought creamy avocado & garlic dressing).
6 large potatoes, cooked and cut up in small chunks
1 -2 cans crab meat, or seafood sticks/fresh crab meat
red wine vinegar
Mix it up and serve while the potatoes are still warm, or as a cold dish.