Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tuna salad is a blend of typically three main ingredients: tuna, eggs, and some form of mayonnaise or mayonnaise-substitute, such as mustard. The tuna used is usually pre-cooked, canned, and preserved with water or oil. It is common to place the spread between two slices of bread thus making a tuna salad sandwich. Quick homemade tuna salad is often made by omitting the eggs and adding dill salad cubes or relish. The reason for the change is that the eggs must be cooked whereas the other ingredients are purchased ready to eat. This version grows out of tuna sandwich recipes that call for mixing tuna and mayonnaise before spreading it on bread. Commercially prepared tuna salad is readily available in the meat or deli section of most grocery stores.