Hearty Winter-Vegetable Soup

Ingredients

Serves 10 to 12

2 tablespoons extra-virgin olive oil
4 leeks, white and pale-green parts only, halved lengthwise, cut into 1-inch pieces, and washed well
3 celery stalks, cut on the bias into 1/2-inch-thick pieces
3 medium carrots, cut into cubes
2 garlic cloves, crushed
2 pinches of red-pepper flakes
Coarse salt and freshly ground pepper
5 1/4 cups homemade or store-bought low-sodium chicken stock
1 1/2 cups water
1 small (1 to 1 1/2 pounds) butternut squash, peeled and cut into cubes
2 Yukon Gold potatoes (about 12 ounces), cut into cubes
1 head escarole, cut into 1-inch-thick ribbons
1 can (15 ounces) chickpeas, drained and rinsed
2 tablespoons fresh lemon juice
2 tablespoons thinly sliced fresh mint
2 tablespoons thinly sliced fresh dill