West African Peanut Stew

Heat oil in a large saucepan over medium-high until shimmering. Add onion, garlic, ginger, and pepper flakes; season with salt and pepper. Cook, stirring occasionally, until golden in places, about 5 minutes. Stir in tomato paste; cook 1 minute more.

Add collard greens, sweet potato, peanut butter, and broth. Bring to a boil, stirring until peanut butter dissolves into broth. Reduce heat to low, and simmer, stirring occasionally, until sweet potatoes are tender but still hold their shape, 18 to 20 minutes. Serve stew topped with millet, peanuts, cilantro, and lime wedges.