1) Coughs: This is one of the few cough remedies you may actually get your children to take. Mix equal parts honey and lemon juice thoroughly. It can be taken one tablespoon about once an hour as needed. There is one precaution children under two shouldn't use honey. Store any leftovers of the syrup in the fridge until it's needed again.
3) Fish: As a rule, I do not like lemon on my fish, but many people do. You can squeeze some on before cooking or after...or both. Fresh wedges, even if you didn't use it in the recipe, make an excellent garnish. It can also be a wise means of serving company. Then those how enjoy it can squeeze to their heart's delight and those who don't can enjoy their fish unadulterated.
4) Hair Care: Lemon water before the last rinse can make a big difference in hair care. It helps to brighten color. When mixed with herbs, you can get an even more out of it. For red hair, add mullein flower tea, and blonds might want to add chamomile. Be aware that it will change the color slightly, so if you're happy with the looks now, leave the herbs out.
5) Mayo: When we want real mayo, I usually make it myself. It's not particularly difficult, but it is a sauce that is very easy to "break." One aspect of making mayo is the need for an acid. Many recipes call for vinegar, but I like either lemon or lime juice, especially if it's being made for a food that lemons can enhance. For some reason, I do like the taste of lemon mayo with some fish.