Complete stitching pattern for both sides – you will have 2 squares of the same size.
I do not wash finished stitched items but you can do it in case f.e. it got dirty while you worked on it.
Make one row of back stitches around each square, stepping away from the pattern side 1 or 2 rows of threads (depending on your pattern visual structure).
If your fabric is not stiff enough it is recommended to attach a one-sided adhesive interlining (vlieseline) to the back side.
It is also recommended to do for the fabric with less tight stricture (Aida 11, 14).
Cut two squares of one-sided adhesive interlining equal to you pattern size, it should not overlap the back-stitched border.
Attach a one-sided adhesive interlining squares to you stitched biscornu sided from the back side with an iron.
Thread the needle to the corner on one side and fasten the thread.
I assemble biscornus using two strands, you can read more about how to fasten strand on the fabric here.
Attach the corner of first side to the exact middle of second side (you can mark it with the pin, if needed).
Start connecting sides with stitches, covering corners.
Connect all sides the same way, leaving the last side open for stuffing.
Stuff biscornu, paying attention to the corners.
Stitch up the last side.
You can add 2 buttons or beads at the center from both sides, tightening your biscornu a little bit.
Or add funny decoration.
That is it!
Happy stitching! 🙂