Fasolakia (Greek Green Beans)

Heat olive oil in a large saucepan over medium heat and stir in onion. Cook until onion has softened about 5 minutes. Add green beans and stir to coat in the oil. Cook stirring occasionally 2 to 3 minutes. Add pureed tomato potatoes salt pepper and sugar. Stir well then add water until beans are barely covered.

Bring to a simmer partially cover with a lid and cook gently over medium-low heat until green beans and potatoes are soft 25 to 30 minutes. Uncover towards the end of cooking to reduce sauce if it is too watery.