Chocolate mint thins

Wafer

• 85 g spelt grain, or whole wheat grain
• 110 g raw sugar
• 250 g unsalted butter, cut into cubes
• 1 tsp vanilla bean paste
• 85 g cocoa powder
• 1 pinch sea salt
• 180 g plain flour, plus extra for dusting

Mint layer

• 260 g icing sugar, plus extra for dusting
• 25 g unsalted butter
• 25 g evaporated milk
• ¼ tsp peppermint oil (food grade)

Chocolate

• 1000 g dark chocolate chips
• 3 - 5 drops peppermint oil (food grade), to taste (可省略)