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How to preserve ginger paste
Add 2 tablespoons (30 ml) of vegetable oil.
The addition of oil helps preserve the paste when it's put in the fridge or freezer. The actual amount you add can be adjusted to your flavor preference.
Any neutral-flavored oil, like canola or avocado oil, will work in place of vegetable oil. Using a small amount of vinegar will have a similar effect, but may affect the flavor.