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In a medium skillet over medium-high heat, brown the sausage, using a wooden spoon to break it up. Set on paper towels to drain.
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In a large skillet, heat 1 tablespoon olive oil over medium heat. Add the sweet potato, onion, garlic, nutmeg, and salt and pepper. Saute until soft, stirring frequently, about 8-10 minutes. Add the kale and continue to heat until just wilted.
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Meanwhile, fill a large, deep skillet with 1 inch of water. Add vinegar and heat water until small bubbles start to form. Do not bring to a boil. Carefully crack the eggs and drop into the water. Alternatively, you may place the cracked eggs one at a time into a small measuring cup, submerge the cup, and gently roll the egg out. Turn off the heat, cover the skillet, and let sit 5 minutes. When the eggs are done, lift them out of the water with a slotted spoon and place on a paper towel to drain.
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To serve: Divide sweet potato and kale mixture among four bowls. Top with sausage. Top each with a poached egg.