Chop onions, bacon, sausage and parsley into small pieces.
Heat up the sunflower oil in the meantime in your pressure pot and add the bacon. Fry for 2 minutes on medium-high heat.
Add the sausage for another 1 1/2 minutes and stir continuously to prevent it from sticking. Add the onions and continue cooking for 1 1/2 minutes.
Add the 4 cans of washed beans, together with the 2 cups of water and bring to a boil. Once it is boiling, close the lid to the pressure cooker and place everything under pressure for about 15 minutes.
Add fresh parsley or dill when serving.