Good-quality nuts, toasted in a little butter and salt, make a magical addition to many salads.
There's nothing more marvelously wintery than orange root veg mash; some butter is all it needs.
Sweet potatoes are ideal for lazy days: just bake, then mash and mix with yogurt, butter or olive oil.
My maternal grandmother made fantastic ox tongue with velvety roasted potatoes. She cooked sweet red cabbage and lovely cauliflower with butter and bread crumbs.