Alexandra Large Cake Lace Mat. The stunning new Alexandra Cake Lace Mat has an Edwardian-inspired, crystal-like design. Cake Lace is so easy to use - simply make to the manufacturers instructions, spreading onto the mat and placing in the oven at 80°C. Bake for 12 to 15 minutes, take out of the oven and cool for five minutes; your Cake Lace is now ready to use!