Ingredients

• 1 pound sweet potatoes, peeled and cut into 1-inch chunks
• 1/4 cup finely chopped red onion
• 8 ounces kale, tough stalks removed and discarded, leaves finely chopped
• 2 tablespoons extra virgin olive oil
• 1/8 teaspoon cayenne pepper (more if you like it hot)
• 3 tablespoons unsalted butter (or to taste)
• 1/4 cup milk

Serves 4 to 6 as a side