Soup made with canned beans is convenient, satisfying and surprisingly sophisticated
1/2 cup chopped onion
1 small celery rib, chopped fine
3 sprigs fresh thyme
2 garlic cloves, sliced
Pinch cayenne pepper
2 (15-ounce) cans great Northern beans
2 tablespoons grated Parmesan cheese
2 cups chicken broth, divided
2 tablespoons unsalted butter
1/2 teaspoon lemon juice, plus extra for seasoning
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