Learn to make tender, buttery sourdough discard hamburger buns with this same-day recipe. All you need is some basic ingredients and a bit of discard.Learn to make tender, buttery sourdough discard hamburger buns with this same-day recipe. With some basic ingredients and a bit of discard, you can save yourself a trip to the grocery store and create homemade burger buns with the perfect texture and rich, wholesome flavor.