Add all of the ingredients (through the serrano pepper) to a slow cooker. Stir to combine. Cover and cook on high for 2 hours or low for 4 hours.
Remove the lid, turn the slow cooker to high and add the kale, cilantro & lime juice. Cook, uncovered, for another 30 minutes.
Taste and adjust seasonings as needed. Serve hot over rice with more cilantro, lime wedges & naan.
Nutrition info does not include the rice or naan.
Calories: 308kcal, Carbohydrates: 34g, Protein: 10g, Fat: 17g, Saturated Fat: 13g, Polyunsaturated Fat: 1g, Monounsaturated Fat: 1g, Sodium: 501mg, Potassium: 783mg, Fiber: 8g, Sugar: 5g, Iron: 5mg