6 | med | Onions, thinly sliced |
6 | tbsp | Olive oil |
8 | oz | Plum tomatoes |
Salt | ||
Black pepper, freshly ground | ||
6 | Eggs | |
2 | tbsp | Freshly grated Parmesan |
A handful of fresh basil | ||
2 | oz | Butter |
This frittata can be eaten warm with a salad or cold on a huge slice of bread.