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My quick formula for frittata requires something sort of starchy (potatoes, rice, pasta, cubes of bread), a vegetable (or several) and some kind of cheese. That said, I have made frittatas (frittatii?) with only vegetables, or with no cheese, etc. The formula is very flexible.
Last night's frittata used leftover Spanish potato salad (potatoes boiled and tossed with romesco sauce) and artichoke hearts left from Monday night's pasta dish.
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I cooked the eggs for about minutes, using a rubber spatula to clean egg off the side of the pan . When the eggs looked mostly set (just a little runny on top), I put the pan under the broiler for another 5 minutes to cook the frittata through. I did not use cheese in this dish because the romesco sauce was fairly rich-tasting and I didn't think I would need the extra richness and saltiness from cheese (I was right).
Let the frittata sit while you set the table. Cut into wedges and serve.
Note 1: My method makes a thin frittata. If you want a thicker frittata, use a smaller pan, and cook the frittata over lower heat.
BTW - My lettuce was stored last week, using my super-duper lettuce preservation method. It truly works well.