- 1
Heat oil in a large saucepan over medium-high heat. Add sausage and cook, breaking up with a spoon or spatula, 3–4 minutes or until browned. Remove sausage with a slotted spoon and set aside.
- 2
Add onion and celery to saucepan and cook 4–5 minutes or until crisp-tender. Stir in garlic and crushed red pepper. Continue to cook, stirring frequently, for 1 minute.
- 3
Stir in stock and beans. Return sausage to saucepan and bring mixture to a boil. Reduce heat and simmer, uncovered, about 20 minutes or until vegetables are tender.
- 4
Add kale, lemon juice and lemon zest; cook, stirring frequently, 2 minutes more or until kale is just wilted.
- 5
Serve immediately topped with Parmesan cheese and croutons.
