Ocado British Maris Piper Potatoes. One of the nation's favourite potatoes, these round, brown skinned, yellow fleshed potatoes have a fluffy texture and buttery taste when cooked. These potatoes are a source of Potassium and Thiamine (B1) and are perfect to bake, mash, roast or chip. Fast food without waste Got leftover roasties from lunch? Scroll down and cook up this quick and tasty Roast Veggie Hash brunch dish the next day! Whether it's large or small, organic or sweet, we've got the perfect potato for you, simply search 'Ocado potatoes'.