M&S 2 Everything Burger Buns Indulge in our everything burger buns made with caramelised onions and garlic topped with white and black sesame seeds, poppy seeds and fine sea salt. They're the perfect addition to any BBQ. Two per pack. All of our breads are a natural source of Vitamin D and Fibre, two nutrients that are naturally low in our diets. We use a natural source of Vitamin D that is produced by yeast, which is why you will find ‘yeast’ on our list of ingredients, not because we use it as part of the dough making process.