Mix the ground flaxseed with the water and set aside, it will go gel-like to become a flax egg.
2 tablespoon ground flaxseed, 6 tbsps water
Preheat the oven to gas mark 5 / 190°c and line an 8-inch baking sheet with parchment paper.
Chop 100g of the chocolate into small pieces and melt in the microwave, then stir through the butter until it melts.
140 g dark chocolate, ½ cup vegan butter
Add the sugar to the chocolate and butter mix.
1 cup coconut sugar
Sift in the the flour, cocoa powder, baking powder, and then add the mincemeat, salt, vanilla and flax egg. Fold the mixture until it's combined.
2 tablespoon ground flaxseed, 6 tbsps water, ¾ cup plain flour, ¼ cup cocoa powder, 1 teaspoon baking powder
Pour the mixture into a baking sheet lined with grease proof paper.
Bake for 15-20 minutes, and leave to cool once out of the oven for around 30 minutes. This is to ensure it sets, yet it will remain a little gooey!
Once cool, melt the remaining chocolate and drizzle over the brownies.