01
Heat the olive oil in a large Dutch oven or soup pot over medium heat until shimmering. Add the onions, celery and carrot and a light sprinkle of salt. Cook, stirring occasionally, until the vegetable are soft, about 10 to 15 minutes.
02
Stir in the garlic, cumin and red pepper flakes and cook until fragrant, about 30 seconds. Pour in the beans and broth and bring to a simmer over medium-high heat. Cook, reducing heat as necessary to maintain a gentle simmer, until the broth is flavourful and the beans are very tender, about 30 minutes.
03
Transfer about 4 cups of the soup to a stand blender, securely fasten the lid, and blend until smooth (never fill your blender past the maximum fill line and beware the steam that escapes from the top of the blender, it’s very hot). Or use an immersion blender to blend a portion of the soup.
04
Return the pureed soup to the pot, stir in the cilantro, vinegar/lime juice and salt and pepper, to taste. Serve.
