[header] How to make vegetarian pho [title] Char or broil the onion and ginger until lightly blackened. [step] Grab 1-2 pieces of onion and ginger with tongs and hold them over an open flame until they've blackened slightly. Place the charred pieces on a plate and pick up a few more pieces with your tongs. 
Continue in this way until you've charred all of the onion and ginger. [substeps] To broil, place the onion and ginger in a shallow pan and slide the pan under your broiler.