In a large stock pot, sauté the onions, celeriac, and carrots in olive oil. When softened add beans and stock to the pan, and bring to a boil. Reduce heat to a simmer, and cook for 45 – 50 minutes. Add liquid as necessary. Beans are done when tender. Remove from heat, and season with salt, pepper, and cider vinegar. Serve over rice.
Hoppin' John Fritters
Use a fine mesh strainer to strain excess liquid from the beans. Lightly mash the beans, and then stir oats and egg into the beans. If the mixture looks too soupy, add a few more tablespoons of oats. Spread about a half cup of cornmeal onto a plate. Set the plate and bean mixture next to the stove while the oil heats.
Heat a 1/2 inch of oil, in a cast iron pan for frying. When the oil is shimmering, drop about a 1/4 cup of the bean mixture onto the cornmeal. Carefully flip and transfer to the skillet. Fry about 3 fritters at a time, being careful not to overcrowd the pan. Drain on rack or paper towels.
Whisk together the mayonnaise, apple cider vinegar, and chipotle in a small bowl. Taste and adjust chipotle or vinegar if necessary. Serve each fritter topped with a dollop of the aioli.