Place your butter and shortening together in the bowl of your mixer. Mix them together on medium speed until they are nice and creamy.
Turn the mixer down to the lowest setting and slowly incorporate the powdered sugar into the shortening mixture. Once you have added all the sugar to the mix pour in the hot water, blackberry jam, vanilla and food coloring.
Turn the mixer up to medium-high speed and continue mixing for 10 minutes until light and fluffy.