Parmentier Potatoes with Garlic & Thyme

What is it?

Small-cut potato cubes are roasted with garlic and thyme, then frozen for reheating at home. The pieces are sized like classic parmentier potatoes, so they cook through quickly and keep a browned edge once heated. Sainsbury’s uses a short ingredient list here, with potatoes doing most of the work, plus garlic and thyme for seasoning. It sits in the frozen potato side dish section rather than the brand’s mashed or chipped options, and it’s the kind of thing you’d heat in the oven or air fryer and serve alongside meat, fish, or vegetables.