In a small saucepan, add the first amount of cream, honey and white chocolate.
Heat on a low heat, stirring often until the white chocolate has completely melted.
Remove from the heat and pour in the second lot of cream along with the pistachio paste and food colouring, if using. Whisk together briefly.
Blend the mix together for 1-2 minutes using the hand blender until all ingredients have been combined.
Pour into a medium mixing bowl or an airtight container.
Chill for at least 2 hours in the fridge but preferably overnight.
Once the ganache has cooled completely and thickened, remove from the fridge.
Whipe using an electric whisk or hand whisk for 2-3 minutes until the ganache has thickened and become pipeable.
To make it even firmer, transfer to a piping bag and place back into the fridge for an hour.
Leftovers can be stored in an airitght container for up to 5 days however it will deflate 1 day after whisking. Leftovers can be whisked up again but it will not be as firm.
Notes
The calorie information is an estimate provided as a courtesy based off the website https://caloriecontrol.org/healthy-weight-tool-kit/food-calorie-calculator/. It will differ depending on the specific brands and ingredients that you use.
Keyword Pistachio, Pistachio cake frosting, Pistachio cupcake frosting, Pistachio Ganache, Pistachio Whipped Ganache, Pistachio White Chocolate, Whipped White Chocolate Ganache Recipe, White chocolate, White Chocolate Frosting, White Chocolate Frosting Recipe