Place a large, empty heavy-duty roasting pan on top of the stove, across two burners.
Heat the pan for a minute, until the pan is quite hot.
Add the oil, and let it heat up for a few seconds.
Place the turkey in the roaster with the breast side up. Position the legs parallel to the short sides of the pan.
Make sure the legs have room to flop open. They should protrude a bit.
Press on the splayed legs so they touch the bottom of the pan.
Let turkey sear for 5 minutes, pressing down on the legs.
Pour wine into the bottom of the pan to a depth of 1/8 inch.
Scatter onions around the turkey and sprinkle them with salt.
Drizzle turkey and onions with a little olive oil.