In a bowl, soak the beans in water with lemon juice for 12 hours* (see note).
In a food processor, combine half an onion and all of the garlic, parsley, green onions. Add a drizzle of olive oil. Blend until smooth and set it aside.
After 12 hours, drain the soaked beans and set them aside.
In a pressure cooker, sauté the blended mixture with olive oil for two minutes or until fragrant. Add the drained beans and increase the heat.
Add the tomato, remaining half onion, potato, bay leaves, and enough water to cover the ingredients by two inches or so. Ensure that the water level is below the maximum line in your pressure cooker.**
Close the pressure cooker, increase the heat to high, and lower it once pressure is achieved. Cook for 15 minutes, then turn off the heat and release the pressure before opening the lid. (If making it in an instant pot, close your pot and set it to pressure cook on high for 15 min)*** (see note)
Remove the bay leaves and discard.
Gather the tomato, onion, and potato from the pot. Blend them until smooth, then return the mixture to the pot. (you can add a ladle full of beans to help your blender blend everything nicely)
Season with salt and squeeze in the juice of half an orange**** (see notes).