Green Black’s Organic Advent Calendar. Green Blacks milk and dark chocolate Advent Calendar is an elegantly presented collection of Dark 70%, Milk with Butterscotch, Dark with Ginger, Milk, Dark 80% miniature bars. Open a door each day to find the tempting treats that have been expertly crafted to make the perfect present for chocolate connoisseurs. Green Black’s individually wrapped dark and milk chocolates. Green Black’s create delicious chocolate made from the finest ethically sourced ingredients.