Easy Blackberry 'N Rum Jam (Without Pectin) - cooking recipe

Ingredients

1 cup blackberry, fresh or frozen
1 cup granulated sugar
1 ounce rum (or cognac)

Preparation

Put blackberries, sugar and Rum in a stainless steel or other heavy duty pot and mash all together with a potato masher.
heating everything to a boil on MEDIUM heat (mixture will raise quickly to the edge of the pot be careful it doesn't boil over!) constantly stir with a wooden spoon.
reduce heat as soon as mixture has raised up, and keep at a slight boil while constantly stirring for 10-12 minutes (mixture will thicken up a tiny bit).
transfer into sterilized mason jar (sterilized by placing jar in a pot with an inch of water and brought to a boil) mixture will be VERY HOT. BE CAREFUL.
ad lid and lightly tighten rim.
lid will pop down after a while. swirl jar to make sure vacuum seal holds. when it does tighten rim.
place jar up-side-down for a couple of minutes and store right side up until use.