Add the olive oil to a soup pot. Turn the heat on high and add the chopped onion and garlic. Sauté for about 8 minutes, until the onion begins to caramelize. Stir occasionally so it doesn’t burn.
Add the water to the soup pot. Then, using an emulsion blender, blend the onions, garlic, and water until smooth.
Add the sweet potato, celery, carrots, maitake mushrooms, spike thyme, bay leaf, vegetable stock, wild rice, great northern beans, and lemon juice. Bring to a boil, and then reduce the heat to low. Let the soup simmer for 40 minutes. Remove the bay leaf, and then it’s ready to enjoy. Yum!