Laird Abernathy's Punch

I've made this differently each time so I'm putting this one down to remember the ingredients:

1 bottle Hardy V.S. Red Corner Cognac

4 oz Courvoisier V.S. Cognac

16 oz Gosling's Black Seal Rum

4 oz Kirsch Grande Reserve Cherry Brandy

Demerara syrup (1 cup demerara sugar, 32 oz water)

8 oz fresh lemon juice