Pre-heat the oven to 375 degrees F.
Sauté the diced onions and diced kale stems in the olive oil and ½ tsp of salt, over medium heat in a medium sized enameled Dutch oven. The correct amount of oil will make the onions and kale stems uniformly glisten, but not pool in the pan. Sauté until the onions are translucent. A little brown color in the onions is OK for this recipe. Expect 4-5 minutes
Add the minced garlic to the pot. You do not want the garlic to brown. Stir and sauté for about one minute.
Add the brown rice to the pot and stir to coat each grain with the aromatic infused oil.
Add the splash of wine to deglaze any fond that has developed and stir until the wine has mostly been absorbed by the rice.
Add the diced sweet potatoes to the pot, along with 3 cups of the broth (saving the 4th cup of broth for the finishing steps).
Increase the heat to high and bring the pot to a full boil. As things are heating, taste test for seasoning. It probably needs some some salt at this point, but how much depends on the how salty your selected broth is. At this point the broth should be well-seasoned.
Once a full boil is reached, cover the pot and transfer to the 375 degree oven, where it will gently simmer for 50 minutes. Set a timer to remind yourself!
While the risotto is cooking in the oven, blanch the chopped kale. Bring a couple quarts of water up to a rolling boil in a new pot. Add the chopped kale leaves to the pot and boil them for 90 seconds to 2 minutes. The goal is to soften and tenderize the kale but not change its color with an extended cook time, You can now either transfer the kale to an ice bath, and then drain it, or you can drain directly into a colander in the sink. The ice bath helps to preserve the bright colors, as it brings the cooking to a hard stop. Either way, allow the kale to drain until you are ready to finish the risotto.
After 50 minutes, remove the pot from the oven, open it and give it a quick stir. Expect the rice to be fully cooked and properly hydrated, with no residual liquid. The sweet potato will be very soft and will spread through the rice like a sauce.
To finish, stir in the butter and the kale, then stir in the remaining 1 cup of broth. The Parmesan cheese is stirred in last. Parmesan cheese can turn stringy if it is over-stirred, and risotto is all about creamy and should never be stringy! One last taste test for seasoning. Stir in a bit more salt only if it needs it.
Finally, plate, add garnishes and accompaniments, and enjoy!