Blueberry Grand Marnier Jam

1 1/2 quarts blueberries (5 1/2 cups)
1/2 cup water
2 tablespoons lemon juice
7 cups sugar
2 packages liquid pectin
1/4 cup Grand Marnier

Directions

1 Place blueberries in large pot.
2 Add water and lemon juice.
3 Mash slightly.
4 Let stand 10 minutes.
5 Add sugar and mix well.
6 Place over high heat, being to full rolling boil and boil hard for 1 minute, stirring constantly.
7 Remove from heat.
8 Stir in pectin and liqueur.
9 Stir and skim for 5 minutes.