Add frosting to the bag, and you are ready to decorate! Draw a test letter on a plate first, before writing on the pie. Published March 14, 2018 at 3264 × 2448 in Pi Pie – gluten-free, vegan, delicious, and covered in Pi Add frosting to the bag, and you are ready to decorate! Draw a test letter on a plate first, before writing on the pie. Continue reading →Add frosting to the bag, and you are ready to decorate! Draw a test letter on a plate first, before writing on the pie.