Wash potatoes thoroughly and cook in boiling water for about 20 minutes. In the meantime, wash and clean the beans and cut them diagonally into pieces. Heat 1 tsp. oil in a small pan. Add the beans, sauté briefly, then add 3 tbsp water.
Season the beans with a little salt and pepper and steam covered for about 10-12 minutes. The bottom of the pan should always be covered with some water. Wash the basil, shake dry and cut the leaves into strips, except for some for garnishing.
Drain the potatoes and let them drip off. Take out the beans. Wipe out the pan and heat 1 tbsp. oil. Fry the potatoes while turning, then add the tomatoes, herbs and beans. Swivel through and season with salt and pepper.
Crumble the cheese over the potato pan and serve. Garnish with remaining basil.