Cut out one circle in white. A slightly smaller circle in the color of the citrus fruit you are making. And a lozenge shape whose sides are the same length as half of your larger, white, circle in the color of your fruit's rind.
Put your circles together! The color on top of the white.
Now sew them together. A running stitch around the edge, another down the middle and then the detail running stitch to make sections in your citrus wedge. You will end up with a spoked wheel as seen to the left.
Sew the lozenge rind to the circle making sure you line up the center stitch with the points on the lozenge. Leave a space to stuff!
Stuff your almost complete citrus wedge with polyfill (or whatever other stuffing you think is appropriate).