Leftovers can be useful. And a little bit like magic.
Leftovers can be really useful - that's nothing new.
Using up leftovers is also a challenge cooks around the world have had to solve since the dawn of time.
No wonder every cuisine has its own specific leftover dishes - arancini rice balls call for leftover risotto, and bubble and squeak calls for the leftover trimmings of a Sunday roast, to name just a couple! And many traditional Greek dishes from either the pot or the oven are actually meant to be eaten over several days.
And it's not just a practical skill: Food waste is a massive global issue - about one third(!) of food produced globally goes to waste every year. And way more than half of that is actually wasted in households: in the UK alone, this adds up to 95kg per year per person.
If sustainability and affordability of your food is a concern to you, then the best place to start is in your kitchen, and you'll make the most impact by simply learning to love your leftovers.

Personally, I rarely find myself trying avoid leftovers, on the contrary!
Leftovers can be many things, and all of them are a little bit like magic:
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But what to do about the looming boredom of the 'same again'?
Well, it doesn't have to be the 'same again'.
Not at all, in fact!
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Here are some of my favourite ways of either upgrading or recycling leftovers:
Jazz it up: Use different toppings and flavourings to get a new taste experience out of the same dish. For example, you can have a soup or a stew finished with cream or yoghurt one day, and with pickles or sauerkraut the next. Or a curry topped with herbs one day and topped with toasted seeds & coconut shreds the next. Or a stir fry with a miso based sauce one day, and a creamy tahini sauce the next.
Get saucy: Make a sauce for dry leftovers, for example falafels, meatballs or roasted veggies. Say a yoghurt sauce, a peanut sauce, or even a tomato sauce.
Add to it: Chuck in a tin of beans, lentils or chickpeas to add volume and substance, and change the character of the dish. Or add some greens.
Hide it: Fried rice, a pasta bake, a frittata, a noodle soup, stew or curry are great ways to use up all kinds of odds and ends, from leftover veggies to leftover Sunday roast.
Cover it up: Add a crust or topping to turn your leftovers into a pie that's even good enough for guest: use a pastry crust, a mash, a layer of thinly sliced veg, or simply a thick later of grated or crumbled cheese and bake until golden.
Upcycle it: Leftover mash can be turned into potato cakes or veggie flatbreads. Leftover rice/risotto into rice balls. Stale bread into the many variations of bread soup. The list goes on!
Layer it: I often use small portions of leftovers (i.e. not enough for a full meal) as an extra layer of flavour in the next meal. Basically, I just chuck it into the next meal (depends on the type of meal, of course). I usually look for a matching consistency. I don't worry about matching flavours... it always matches once all the layers come together.
Plate it up: Or if you don't want to 'chuck it all in' you could have a tapas night: Plate up different bits of leftovers, maybe add a salad or a piece of cheese and some olives and off you go, Spanish style!
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I'm sure there are many many other ways of using leftovers.
What is your favourite? I'd love to find out!
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PS. Hot tip: If you're stuck for ideas just type in your ingredients into a search box. You can be sure that there will be plenty of recipe inspiration for any combination, even the oddest.
