Mark bowl at desired height, and cut. Save top for possible future project. Clean bowl's interior with spoon. If needed, take a small metal chisel or similar object and clean interior to as smooth a surface as possible. Once you have removed all of the rough interior, sand interior, and edge, until smooth.
Drilling Edge
With carpenter's pencil or chalk, mark evenly spaced holes around the circumference of the bowls edge, approximately ¾" down and ½" apart. Drill each hole with 1/8" bit. Brush off any excess dust, and sand any rough areas around drilled holes if needed.
Sealing Bowl
Spray several even coats of Krylon Make it Last Clear Coat Sealant or other outdoor safe sealant spray, allowing gourd bowl to dry thoroughly between coats. If you wish to decorate bowl in any manner along with the sweet grass, do so now before proceeding to the next step. Painting or etching are both nice additions, and compliment the sweet grass edge beautifully.
Applying Sweet Grass
Cut a piece of sinew approximately four times the width of the bowl's edge, thread yarn needle with sinew. Lightly roll short lengths of sweet grass. Apply evenly around the bowls edge, holding each length in place by wrapping sinew around sweet grass and through pre-drilled holes. Secure sinew by overlapping beginning holes at the end; tie a knot towards the inside of the bowl's edge and weave into previous sinew wraps to finish.