2g means two grams, which is on the package. For example, 200g of bagged auricularia auricula only needs 1%, and the auricularia auricula as big as your ear is about 2-5g, which can only be a rough estimate and cannot be very accurate. The weight in the recipe is only the proportion of material consumption, so there is no need to be too serious. If the dosage must be accurate, buy a household kitchen electronic scale.