Smash 2 blackberries and 2 raspberries together in a cup. Blend to a fine paste if preferred.
Add 1 shot vodka and blend with berry paste.
Add 1 oz grenadine, 2 oz sprite, and 1 shot blue curacao. Mix in shaker.
Line a plate with 1 part pumpkin pie syrup and 1 part sugar. Roll the rim of a drinking glass in the syrup followed by the sugar.
Place ice cubes in drinking glass and pour in the Witches Brew Widow mixture. Enjoy!