2 tablespoons olive oil
2 onions - peel and finely chop
1 head garlic - peel and finely grate
400 g canned whole plum tomatoes - roughly chop them with a fruit knife while still in the can
300 g potatoes - peel and roughly chop
400 ml water
salt - to your taste
black pepper - freshly ground from a pepper mill, to your taste
