A lettuce unparalleled in crispness and taste, it is the primary component of Caesar salads, which were first made by Caesar Cardini, born in 1896 near Lago Maggiore, Italy, who had immigrated to the US to enter
the restaurant business. One evening, short of ingredients, with the likes of Clark Gable and W.C. Fields in attendance, he made the bold decision to improvise, and to do it in front of the patrons. Fresh romaine,
lemon juice, garlic oil, coddled eggs, Parmesan cheese, Worcestershire sauce, anchovies, croutons and salt and pepper....it was loved at first bite, and so the tradition began.

Romaines generally tolerate summer heat better than most other types and are known as a "cut and come again" lettuce because they will re-sprout from the base of the plant given a long enough season.

When pre-trimmed, cleaned and cored, the yield is approx. 95%. Plan on 4 to 6 servings per head of lettuce. 

Romaine lettuce is free of fat and cholesterol, is very low in sodium,
and is also low in calories. Diets low in sodium may reduce the risk of high blood pressure, the development of which is dependent upon many factors.
Iceberg lettuce is very low in sodium!

Try these websites about Romaine lettuce: 
http://www.5aday.com/romaine.html

Dole Food Company http://www.dole5aday.com 
The Nunes Company, Inc. http://www.foxy.com 
Misionero Vegetables http://www.misionero.com