In a medium, heatproof bowl, thoroughly combine the minced ginger, chopped scallion, minced garlic, and salt.
Pour the oil into a small saucepan or skillet and place over high heat.
Heat the oil until it is shimmering and just beginning to smoke.
With extreme care, pour the hot oil directly over the ginger-scallion mixture in the bowl. It will sizzle and pop—this is what blooms the flavors.
Stir everything together well to combine.
Serve immediately or let it cool before storing.
Add a kick of heat by mixing in 3 tablespoons (45 ml / 1.5 fl oz) of finely chopped fresh chile (like serrano or Fresno) to create a zesty Chile-Scallion Sauce.