Algebra - Abstract algebra. 1  Abstract algebra extends the familiar concepts found in elementary algebra and arithmetic of numbers to more general concepts.
Choose the freshest looking lettuce for storing. Photo Credit anna1311/iStock/Getty Images. Romaine lettuce's high water content means there is no long-term preservation method suitable for making the lettuce last longer. Drying, canning and freezing all produce inedible results. For the best nutritional value, romaine lettuce is best served when it's fresh, green and crisp. Storing the lettuce in a refrigerator is the best option for preserving it, although there are a few other measures that can be taken to ensure romaine lettuce lasts as long as possible.
Iceburg lettuce is one of the most readily available types of lettuce and easy to use for lettuce wraps. Other types of lettuce that are good for lettuce wraps include romaine lettuce, butter lettuce and escarole. For parties and other events, you can put out platters of various types of lettuce and different fillings and allow guests to make their own lettuce wraps.