Pressure Cooker Ribollita With Smoked Mozzarella Toasts

Step 1

Turn on the sauté setting of a 6- to 8-quart electric pressure cooker and heat the oil. Add the onion, season with salt, and cook, stirring occasionally, until limp and translucent, 6 to 8 minutes. Add the leek, celery and fennel, season with salt, and cook, stirring occasionally, until softened and fragrant, about 8 minutes. Add the chopped garlic, bay leaves, red-pepper flakes and white wine; season with a generous amount of pepper. Stir well and let the wine come to a simmer before turning off the heat.

Step 2

Add the stock, beans, tomatoes, thyme, rosemary and lemon juice. Cook on high pressure until the beans are creamy, 50 minutes to 1 hour.

Step 3

Allow the pressure to release naturally for 10 minutes, then release the remaining pressure manually. Turn on the sauté setting. Remove and discard the bay leaves and herb sprigs (if using). Stir in the greens and vinegar.

Step 4

Let the greens cook, stirring occasionally, while you make the toasts: Turn on the broiler. Rub the bread slices with the halved garlic and drizzle them with olive oil. Position a rack 6 inches from the broiler, and toast the slices until very light golden, 1 to 2 minutes. Add 1 slice of mozzarella to each toast and broil until softened and browned in spots.

Step 5

Season the soup to taste with salt and pepper. Divide the soup among bowls, adding a mozzarella toast in each bowl. Top with the reserved fennel fronds and black pepper or red-pepper flakes, if desired.