How to Make It
Preheat the oven to 425°. On a large rimmed baking sheet, toss the onion rings with 2 tablespoons of the olive oil and season with salt and pepper. Roast for about 35 minutes, until the onion rings are richly browned on the bottom.
Meanwhile, in a large pot of boiling salted water, blanch the kale until just tender, 4 minutes, and drain. When it's cool enough to handle, squeeze the excess water from the kale and coarsely chop the leaves.
In a large, deep skillet, heat the remaining 6 tablespoons of olive oil. Add the shallots and garlic and cook over moderately low heat until softened, about 7 minutes. Add the kale, toss well and cook over moderate heat until hot throughout and evenly coated with the shallots and garlic, about 2 minutes. Season with salt and pepper. Transfer the kale to a large bowl. Garnish with the roasted onion rings, drizzle with olive oil and serve.