For a more intense vinegar flavor, use apple cider vinegar instead of white vinegar. Adjust the amount of salt to your preference. Start with 1/3 cup and increase if needed after tasting. Be sure to use raw, unroasted peanuts in their shells for this recipe. The longer the peanuts soak, the more flavorful they will become. Store leftover boiled peanuts in the refrigerator in their cooking liquid for up to 5 days.