Black Bean Coconut Soup

Name: Black Bean-Coconut Soup
Ingredients: 3 tablespoons extra-virgin olive oil; 2 medium onions, chopped; 3 garlic cloves, finely chopped; Kosher salt; Freshly ground black pepper; 1 bunch cilantro, stems and leaves separated; 2 cups chicken stock; 2 (15-ounce) cans black beans; 1 (15-ounce) can coconut milk