Adding the sashing changes the size of the setting triangles for Jelly Tarts 3 (page 20).
Here are cutting instructions:
From the tan fabric, cut
2 – 22 1/2″ squares. Cut the squares from corner to corner twice on the diagonal to make 8 side setting triangles.
2 – 13″ squares. Cut the squares from corner to corner once on the diagonal to make 4 corner setting triangles.