The recipe calls for the raspberries to be used in two portions. You can freeze 4 C. for later.
Crush 4 C. raspberries and place them in a sterilized, heatproof 2 quart jar
Add vinegar and and cover the jar
Set the jar in a deep saucepan and fill with water to come halfway up the jar
Set over medium heat and bring the water to a boil
Reduce the heat and keep the water simmering for 20 minutes
Remove the jar and set aside, uncovered to cool the contents
When cool, add a lid to the jar and set it aside
Shake the jar every day for 2 weeks
Strain the jar to remove old raspberries, it is okay to lightly press the berries to extract all the juice
Crush 4 C. raspberries and pour infused vinegar over them
Repeat the scalding as done above
Let the vinegar rest for two weeks, shaking every day
Strain the vinegar discarding the fruit, it is okay to lightly press the berries to extract all the juice
Line a funnel with an unbleached coffee filter and place in a sterilized bottle
Filter the vinegar into the bottle
Cap or cork the bottle and store in a cool dark pantry