Place the gochugaru, chili flakes, salt, minced garlic, and minced ginger into a bowl that can handle heat, like ceramic or a stainless steel mixing bowl (see note 4) Pour the 1/3 cup of oil into a saucepan and heat on medium-high for about 2 to 3 minutes, until the oil reaches 325ºF to 350ºF (162ºC to 176ºC). Turn off the heat. Very carefully pour the hot oil over the spices. Then, set the oil aside to infuse.