Roma tomatoes are a variety of Italian plum tomatoes. Shaped like small pears, they have less moisture and consequently have a more concentrated tomato flavor. Italian plum tomatoes are used for recipes where less liquid is desired.
Parmesan cheese can be used in place of Romano cheese. Both are Italian hard cheese; Romano has a sharper flavor than Parmesan because it is made with goat's milk. Parmesan is made with cow's milk.
Substituting 8 egg whites for 4 of the whole eggs will reduce the cholesterol by about 215 milligrams and fat by about 5 grams per serving of this recipe.
This frittata is perfect with melon wedges and tall glasses of iced tea.