Chicken eggs are most commonly used. Duck eggs are also available. Eggs are sold in standard sizes of jumbo, extra large, large and medium. Eggs should be stored only in refrigerator and can be stored for about a month. Normally color of eggs is white but brown color ones are also available. Useful tips :- — To boil: keep in a sauce-pan for about 5 minutes after taking out from refrigerator. Then put on heat and bring to boil and boil for about 1 minute. Remove from heat and allow to cool for about 12 minutes. Remove shell. — To beat eggs: separate white of the egg by cracking in the middle and holding over a bowl and shaking a little taking care not to break the yolk. Beat the white separately for best result using a fork or using electric beater. Beat till white forms soft peaks and becomes thinner. Yolk is to be beaten separately in the same way. Although eggs can be beaten with while and yolk together.