Slice the onion into thin wedges, through the root end. Toss with the olive oil, season with salt, to taste, and spread out on a baking sheet.
3
Roast until just soft and brown, about 20 minutes. Set aside to cool.
4
Put the spinach and onions in a large bowl. Drizzle with some of the dressing and toss. Add more dressing as needed; spinach should just be lightly coated.
5
Divide salad among 4 chilled plates. Top with pecans, goat cheese, and dried cranberries. Serve immediately.