Tomato Fritatta

6 eggs
100 ml sour cream
30 g grated cheese
2 tbsp parsley,chopped
3-4 tomatoes,cut in pieces
1 onion,chopped
salt,pepper
knob of butter

Fry the onions in the butter,then add tomatoes,season with salt,pepper.Cook for 2-3 min.
Whisk together eggs,sour cream & chopped parsley,season.
Pour the egg mixture over the tomatoes.
On the low heat cook the frittata until bottom is golden in color,then scatter the grated cheese on top & place it under the grill until cheese is melted.