This Senate Bean Soup recipe has been simmering in the halls of the U.S. Capitol for more than a hundred years, and once you make a pot of it at home you will understand exactly why it stuck around. This is a soup built on humble ingredients: navy beans, a smoked ham hock, and a few aromatic vegetables slow simmered until the beans turn creamy and the broth is rich with smoky ham flavor.
Soak the beans overnight in cold water, then drain and rinse.
Place drained beans and ham hock in a Dutch oven with chicken broth, bay leaves, and enough water to cover by 2 inches. Bring to a boil, then reduce heat and simmer covered for 1 1/2 hours.
Sauté onion, celery, and carrots in olive oil until softened, then add garlic and thyme during the last minute.
Stir the sautéed vegetables into the pot and simmer uncovered for 45 minutes to 1 hour, until beans are tender and starting to break down.
Remove ham hock, shred the meat off the bone, and return it to the pot. Discard bay leaves.
Season with salt and pepper to taste, mash a cup of beans for a thicker texture if desired, and garnish with fresh parsley before serving.
Notes
Do not skip soaking the beans, since it helps them cook evenly and reduces overall cooking time.
Simmer gently rather than boiling hard, so the beans stay intact instead of turning mushy.
Taste and adjust seasoning only near the end, since the ham hock adds a lot of salt on its own.
If your soup gets too thick as it sits, thin it out with a splash of broth or water when reheating.
A splash of apple cider vinegar or a squeeze of lemon right before serving brightens up all the smoky flavors.
For the Idaho-style version favored by Senator Fred Dubois, stir in about 1 cup of creamy mashed potatoes during the last 30 minutes of cooking.
Swap the navy beans for great northern beans or cannellini beans if that is what you have on hand.
Add a pinch of cayenne pepper or a few dashes of hot sauce for a spicier bowl.
Make it in a slow cooker by combining everything except the sautéed vegetables and cooking on low for 7 to 8 hours, adding the sautéed vegetables in the last hour.
Store leftovers in an airtight container in the refrigerator for up to 4 days or freeze in individual portions for up to 3 months.