Lemons are, after oranges, the most popular citrus fruit grown in Italy. However, unlike oranges, which people mostly eat, they are used almost exclusively as an ingredient or flavoring. While some gourmands frown at squeezing a lemon over fried foods, e.g. veal cutlets or fish -- they say it masks the flavor of the food -- I find a little freshly squeezed lemon to be quite refreshing, especially on a hot day. There are other things too, including Limoncello...
An intriguing, very refreshing pasta sauce made with lemon and ginger root.

© Kyle Phillips Licensed To About.ComOr, Lemony Pasta Salad: I harp so much on hot weather that a little more now won't hurt; this will be quite refreshing on a hot day.
Or, Mezze Penne With Lemon and Peas: This is a refreshingly cool summery dish that will be quite nice either at table or taken along to a picnic.
There are many variations on grilled lamb chops. These are quite nice, and lemony. Perfect for a cookout!
Abbacchio is
Romanesco for lamb, and the verb
brodettare means to thicken a dish with a mixture of egg yolks and lemon juice. Very tasty., and an ancient cooking technique that may date back to the Romans.
This is the grilled chicken Vittorio used to make for cookouts of Fiesole's Misericordia, a civic association. He marinated his chicken in olive oil and chopped herbs, to which I add lemon zest and lemon juice. People snatch it up.

© Kyle Phillips Licensed To About.ComGuido serves his veal shank with a tasty lemony sauce that will have you preparing the dish again (or doing something similar with a different cut, say osso buco) to enjoy some more.
In other words, Citrus Cake. You can use either lemons or oranges, and people will want more.
This almond and lemon cake does require some effort, but is quite nice, and if you like lemons you will like it very much. As an added bonus, it has no flour at all, which is good for those who must avoid gluten.
Lemon Sherbet is a little more involved, but again oh so nice on a hot day. And a good break in the midst of a long meal too.