The virtue of frugality

I still remember the first time when I made 賽螃蟹 (a Chinese dish of stir-fried egg whites) back in boarding school, a friend of mine asked alarmingly, 'What are you going to do with all those egg yolks?' - and we're talking like 9 yolks here. 'To the bin, of course,' I replied, imperious and supremely confident in my own logic. Those poor egg yolks did end up in the bin of course, and ooking back I'm totally appalled by my attitude and ignorance back in those days. I secretly think that I inherited some of that 'wastefulness' from my mum, who never hesitated to throw away leftovers at dinnertime, even when my grandma wanted to save some tidbits for the next day.
I continued to cook like that for the first few years of my 'cooking life' (starting in boarding school) but gradually I started to think more (and harder) about where food came from. Not just where this particular sea salt was harvested, or whether my chicken is a
Bresse - it's thinking about the lives of the animals who sacrificed themselves (unwillingly) for our sustenance and carnal pleasure; those farmers, fishermen and workers who worked an imaginably hectic life day and night so that we can just buy our food instead of having to hunt/fish/butcher/grow our animals or produce. It dawned on me that making the most out of one's ingredient is almost a moral imperative - a Kantian categorical imperative even.
So, I gradually tried to make the most of what I had. When I buy a whole chicken, I would save the feet, wing tips and head for making stock; I would save rendered chicken, pork and beef fat in individual containers so that I can cook with them; I would save grated ginger from squeezing ginger juice for frying rice with later; I would
save excess tart crust for nibbling; I would
add the peel when I poach apples or pears; I would try to pack most unfinished dishes when I eat out, and so on. Not only is it a healthy thing to do, being thrifty with every bit of your ingredient also means that you gain extra flavours at no additional cost. All those skins, peels and rendered fat can 'add' to your dishes in myriad ways and could have much, much better use than a knee-jerk tossing to the bin.
Of course, this is not to saying that I've reached the point where I would try to turn all those unused egg shells into something else - I heard that they are actually pretty good for you, by the way. But I do try to exhaust an ingredient as much as I can. This week I made some black sesame soup (芝麻糊), which is basically black sesame pureed with water and sweetened. Since I had to pass everything through a fine muslin cloth to remove all the 'bits', I was left with a
lot of ground sesame. I then used this leftover sesame paste to make a black sesame pound cake. The leftover paste still had some moisture in it and helped keep the cake moist as well.