Wash green beans, cut off the ends and then cut into small pieces.
Bring to the boil briefly in a pot of water. Then strain.
Peel and chop the remaining ingredients and put them in a pot with the green beans. The white beans and corn are added at the end, because they are already soft.
Add tomatoes, spices and water.
Let the whole simmer covered for about 30 minutes.
Finally, strain and rinse the canned white beans and corn, then add.
Season everything to taste and thicken the sauce with flour. To thicken the liquid, mix the flour or starch in a cup of cold water, add to the liquid and bring to the boil.