1
Soften onion, celery, and carrot in olive oil over medium heat — 10 minutes, until very soft.
2
Add garlic and rosemary, cook 2 minutes.
3
Mash one tin of beans roughly. Add both tins of beans, stock, parmesan rind if using.
4
Simmer 20 minutes. Add kale in the last 5 minutes — it should remain vibrant green.
5
Remove rosemary and parmesan rind. Season generously. Serve with crusty bread.