Citrus Slices: stem stitch an outer circle; chain stitch just inside; stitch two long chains in the left and right of each segment, finishing just inside the top edge. Use varying tones of the color on each slice.
The first stitch is a single herringbone and then filled in the curve with closed herringbone making bigger stitches on the outside curve. I suggest you draw the shape/curve you want onto the fabric. It is quick and easy to do and can be used 'as is' or a