First of all you make a template for the main shape out of two pieces of freezer paper ironed together.Then you use the starch method of creating the curves on the template. I must admit that I am a big fan of the starch method, but it had never occurred to me to use two pieces of freezer paper, despite the frustrations of the sogginess of only using one! Next you use water soluble glue (Pritt in my case) to glue the quarter circles onto the wrong side of the template, and this enables you to open out the seam and sew along the fold line created by the starch! Easy!
It was easy too, and although the preparation was a bit fiddly, the results were worth it, as you can see. I haven't put the method in detail as if you click on the link to Sharon's site, and look at 'free stuff' she has an excellent tutorial on how to make a Pieclique circle!