Add oxymel, Dijon, oil, salt and pepper to a blender. Blend until smooth.
Place the delicata on a sheet tray lined with parchment and toss with olive oil. Season with sea salt. Roast for 15-20 minutes or until the squash is cooked through. You will want the edges of the squash to being caramelizing and the seeds dark and crisp.
Bring a medium pot of water to a boil. Season lightly with salt and add farro. Cook for 10 minutes or until tender. Drain and return to pot, cover with a lid and let rest for 5 minutes. Remove lid and add half of the vinaigrette while the farro is still warm.
Add the farro, squash, walnuts, swiss chard and remaining vinaigrette to a large bowl. Toss to evenly coat all ingredients with the vinaigrette.