Preheat Oven to 375. Wash, peel and cut into ~3/4 to 1 inch chunks. Transfer into a large bowl,add in all ingredients and toss. Layer on a baking dish and bake until tender( About 45 minutes). Bake covered (with foil) for the first 35 minutes and uncovered for the remaining 10 minutes
Wash and remove large stems from Kale. Bring an appropriately large pot of water to boil, add salt. Carefully add Kale into boiling water. Use a wooden spoon to gently push down until the kale is completely submerged in the water. Boil for 2 minutes. Remove and transfer into an ice bath. (Quick warm in skillet prior to serving)
Heat oil in cast ion skillet. Saute onion for about 2-3 minutes, Add in diced Roma tomatoes and continue to cook for another 5 minutes. Stir occasionally.`
Add kidney beans and give it a good stir. Blend remaining onion, leeks and garlic with some water (1/4 cup), Add into skillet with an additional 1/3 cup of water. Let simmer for another 7-10 minutes. Adjust seasoning and serve
Enjoy Kidney beans, with a side of Kale and Oven Roasted sweet potatoes.