Tie each hen's legs together with butcher's twine or a blanched scallion green.
Coat a large saute pan with olive oil and bring to medium-high heat. Season the hens on both sides generously with salt. Carefully lay the hens in the pan, skin side down, and cook until the skin becomes brown and crispy, 6 to 7 minutes. Turn the hens over and brown on the flesh side. Do not crowd your pan, you may need to do this in batches. Remove the hens to a sheet tray.
Meanwhile, combine the molasses and garlic in a saucepan over medium heat. Bring the molasses to a boil and reduce by half until syrupy, about 20 minutes.
Brush the hens on both sides with the reduced molasses. Put the hens in the oven and roast until they are cooked through, basting occasionally, about 20 minutes.
Remove the hens from the oven and garnish with the sliced scallions.