Prepare 2-8" cake pans with grease & parchment paper lining & preheat the oven to 350°F
Grind the pistachios in a food processor or chop as fine as possible by hand with a knife, set aside
Combine the plant milk with the apple cider vinegar & vanilla set aside.
Sift the flour with the salt, baking powder & baking soda
Cream the vegan butter & sugar on medium to high speed until light & fluffy, this may take 3-5 minutes. Scrape the bottom & sides of the bowl from time to time to ensure an even mix.
Turn the speed down to low & add 1/3 of the sifted dry ingredients mix just until it is combined
Now add half of the plant milk & mix just until combined
Repeat with another 1/3 of the dry ingredients, the other half of the plant milk then the last of the dry ingredients.
Last add the ground pistachios & mix well. If using food color add it now
Portion the batter into your prepared pans & bake in the preheated 350°F oven for 20 minutes. Then turn the oven temperature down to 300° & bake for another 15 minutes or when a toothpick inserted into the center comes out clean, no raw cake batter.
Cool the cakes in the pans until they are cool to the touch, then flip them out onto a wire rack to cool the rest of the way.
Prepare the buttercream recipe of your choice & add the Rose Extract at the last stage of mixing, tasting for your desired flavor- you can add more or less of the extract according to your taste.
Fill & Crumb Ice the cake as shown in the video tutorial & refrigerate to cold while you make the mirror glaze.
For the Mirror Glaze: In a large bowl combine both chocolates chopped into smaller, same sized pieces
Combine the sugar, water, sweetened condensed coconut milk & corn syrup & heat over medium heat stirring often to at least 150°F then add the agar powder
Whisk constantly and bring to a rolling boil then pour over the chocolate in the bowl & whisk to melt. Add color if desired
Cool to at least 90°F before pouring it over your cake.
Place your chilled cake on a cooling rack set over a parchment paper lined sheet pan
Pour the mirror glaze over the cake letting the excess run down over the sides.
The agar will cause it to set very quickly so try not to use a spatula to ice it, just allow the excess to drip off
You can reuse the excess glaze, just scrape it off the parchment paper & store in a clean container in the refrigerator for up to 2weeks- simply rewarm when needed
Decorate your cake as shown in the video or as you prefer :)