Pick thru the beans, checking for small rocks, blemished beans, etc and remove. Prepare the beans by following product directions by either soaking the beans overnight, or using the quick soak directions. Rinse well, set aside.
In a large stock pot, heat the olive oil over medium high heat. After chopping add the, onions cabbage, carrots, celery & bell peppers to the pot, season with the red pepper flakes. Add the bay leaf & ham hock. Sauté until tender, 5-7 minutes.
Next add the canned mushrooms (juice & all), fire roasted tomatoes and beans to the pot. Add the beef broth and top with enough water to cover the beans about an inch. Simmer covered for 1 to 1 ½ - 2 hours, stirring occasionally until the beans are tender. Keep an eye on it and add additional water as needed.
When the beans are tender, taste for seasoning & add the salt. Remove the hambone and pick the meat off it and add it back to the soup (if desired or just discard - it's done it's job adding all that flavor!).
Remove the bay leaf and discard. When you turn off the heat add in the lemon juice & parsley, mix well and serve!