Preheat the oven to 400 degrees F.
In a food processor, finely chop the garlic, kale, walnuts, parmesan, salt and pepper. Pour in the olive oil, pureeing until the pesto is combined.
In an ovenproof dutch oven or large pot, warm the olive oil over medium heat. Sauté the onions for 4-5 minutes until they soften and become translucent.
Stir the kale pesto into the cooked risotto. Then fold in the kale leaves. The heat will gently soften the greens.
Top the risotto with more Parmesan and walnuts before serving.