Ingredients
12 ounces dry cannellini beans
1/4 cup extra-virgin olive oil
1 onion, finely chopped
4 cloves garlic, minced
1/2 teaspoon red pepper flakes
1 bunch collard greens (about 2 lbs.), stems removed and leaves cut into 3-inch-thick strips
1 3- to 4-inch piece Parmesan rind
7 cups water
Coarse salt
2 tablespoons red wine vinegar
Preparation
Cover beans with 3 inches of water in a medium pot. Bring to a boil. Remove from heat and cover for 1 hour. Drain.
Heat oil in a large pot over medium-high heat. Saute onion, garlic, and red pepper flakes until tender, about 4 minutes. Add collard greens in batches, stirring until wilted. Add beans, Parmesan rind, and water. Bring to a boil. Reduce heat and simmer, covered, until beans and greens are tender, about 1 hour 20 minutes. Season with salt and vinegar.
