In a cast iron skillet, heat the olive oil over medium heat.
Add the onions and crushed red pepper.
Cook until the onions are soft and golden.
Add the garlic, and cook for about 30 seconds.
Add the sweet potatoes, and cook until soft. Add a few tablespoons or ¼ cup of water to help steam the sweet potatoes, if necessary.*
Add the shrimp, and cook for 2-3 minutes or until they turn pink.**
Turn the heat to low, and add the kale, stirring until wilted.
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