I have recently made boysenberry cordial for the first time. It was so easy and tasted very yummy.
1 1/2 cups water
3 cups sugar
Juice of 1/2 lemon and rind of 1 lemon
1/2 tspn citric acid
1 cup boysenberries
Dissolve the sugar in the water, add lemon juice and rind, then add the boysenberries, simmer for a few minutes, then strain and bottle.
This makes a thick concentrate, so add a little to a glass, then top with water.