Your sourdough starter should be at least 5 days old by the time you wish to use the discard for this recipe. You will need a total of 175g of sourdough starter to make these vegan English muffins. Pay close attention to your sourdough starter and ensure to feed it in regular intervals to keep it alive. At the time of using it for this recipe, it should be bubbly and smell similar to fermented yoghurt, and roughly double in size in under 10-12 hours.