01 - Heat the olive oil in a large skillet over medium heat.
02 - Add the sliced leeks and carrot. Sauté for 5-7 minutes, stirring frequently, until the leeks are soft but not browned.
03 - Add the minced garlic and cook for 1 minute until fragrant, being careful not to burn it.
04 - Stir in the butter beans, thyme, salt, and pepper, mixing well to coat everything evenly.
05 - Pour in the vegetable broth and bring to a gentle simmer.
06 - Cover and cook for 10 minutes, stirring occasionally, until everything is heated through and flavors have melded together.
07 - Uncover, add the lemon zest, and simmer for another 2-3 minutes to allow the sauce to thicken slightly.
08 - Taste and adjust seasoning if needed. Sprinkle with fresh parsley before serving.