This is the national food of Greece
One cup of white beans
2 stems of celery
one heaped teaspoon of Salt
Two fresh tomatoes or a tin of peeled tomatoes
Boil the beans in a pot for about 5 minutes.
Drain the water
Add 4 cups of fresh water
Add all the ingredients except the olive oil.
Close the pressure-cooker and once in pressure cook for 15 to 20 minutes.
Add fresh olive oil and serve.
If no pressure cooker is available then, in order to save on your camper's gas, you must soak the beans from the night before. Then, on the day, just boil the beans and change the water as described above. After that, boil just the beans for 20 minutes and then add the rest of the ingredients as above. You may need to add more water because some will be evaporating.
Serve with fresh bread, feta cheese, olives, pickled vegetables etc.