In a large skillet or pot, warm the oil or butter over medium-high heat. Sauté the onion until translucent, about 5 minutes. Add the beef and brown through.
Once the beef is browned, add the garlic and tomato paste and incorporate well, cooking for another 30 seconds or so.
Add the squash, water, salt, smoked or regular paprika, red pepper flakes, and some black pepper. Stir well and cover. Cook, covered, for 10-15 minutes, or until the squash is cooked.
Remove the lid and stir well. Then add the chopped kale to the top and cover. Cook another 3-4 minutes, or until the kale is fully wilted, but still bright green.