Step 1

Preheat a soup pot over medium heat. Add the oil, if using. Saute the onion for 2 to 3 minutes or until barely translucent. Add the celery and carrot, and cook for another 2 to 3 minutes.

Step 2

Add the garlic, thyme, parsley, oregano, red pepper, black pepper, and salt. Stirring frequently, cook for about 1 minute. Sprinkle flour into the pot, and stir to distribute.

Step 3

Add the milk, and whisk to dissolve the flour. Bring to a simmer, and cook until thickened, about 3 minutes.

Step 4

Add the water, broth, and potato. Simmer until the potato is barely fork tender, about 5 minutes. Add beans, kale, and liquid smoke, if using, and simmer for about 5 more minutes or until potatoes are tender.

Step 5

Remove from heat, and stir in lemon juice. Taste and adjust seasonings as desired. The soup will continue to thicken as it rests.