Don't throw away those skins.
I've heard about not peeling carrots, apples and pears before eating them, as much of the nutrients lie in the skin, but onions and garlic?
Well, research now shows that just like fruit and vegetables, a lot of the nutrients is found in the skins of onions and garlic.
It's great especially for a lazy cook like me. No need to peel them before using!
Dr Marilyn Glenville, an expert in nutritional therapy in both Britain and the United States, was reported as saying in the London Daily Mail newspaper that peeling garlic cloves removes the phenylpropanoid antioxidants which help fight the ageing process and protect the heart.
Despite the controversy over the efficacy ofeating organic, I would use only organic onions, otherwise you may be inadvertently introducing pesticides into your diet. And if you're worried about chewing into the papery skins of onions, steep them first.
Another well-known advocate of alternative medicine, Dr Mehmet Cengiz Oz, better known as Dr Oz, author and television personality, also advocates not peeling the onion.
While onions are a good source of antioxidants, the skin actually has more antioxidants than the onion itself. It is also rich in quercetin - a flavonol that can reduce blood pressure and prevent arterial plaque that can cause stroke, he said.
But not any old onion should be used for such treatment.
Despite the controversy over the efficacy of eating organic, I would use only organic onions, otherwise you may be inadvertently introducing pesticides into your diet.
And if you are worried about chewing into the papery skins of onions, steep them first.
Whether cooking a soup or a stew, you can throw in the skins and let them stew.
You can then take the skins out midway, as most of the nutrients would have steeped into the liquid, or you can eat them.
Or you can make a tea of them, steeping the skins in boiling water, then straining them to use the liquid, which I did here for a black bean soup.
If you use red-skinned onions, you will get a lovely rose-coloured liquid for the pot.
While the Chinese do cook black beans, a fibre- and protein-filled food that is rich with anthocyanins, which are plant pigments that may help lower the risks of diabetes, heart disease and cancer, they do it in a simple soup made with pig's tail.
Here, it is a chunky, hearty soup, cooked often with a ham bone or bacon.
It is a filling and comforting soup, perfect for those days when you do not feel like doing much in the kitchen, for it sort of cooks itself.
I cook it when I want only soup for dinner, but I omit the ham bone as I find the smokey flavour too overpowering.
Instead, I rely on chicken stock to provide fullness to the broth.
Besides, the beans themselves deliver lots of big flavours to the pot, together with a red bell pepper, a celery stick, a carrot and, yes, those onions.
Aside from the bay leaf, I love adding chilli flakes and a dollop of sour cream or yogurt to cut through the richness.
Redolent with spicy flavours and chockful with nutritional goodness, it is a meal in a cup.
- Sylvia Tan is a freelance writer and cookbook author. Her previous Eat To Live recipes can be found in two cookbooks, Eat To Live and Taste.