There is something quietly satisfying about opening the fridge and finding exactly what you need, rather than a sad bag of spinach that has turned to slime at the back of the shelf. Reducing food waste in a home kitchen is not about being perfect or living like a monk. It is about a handful of simple habits that save money, make cooking easier, and mean less goes in the bin each week.

Start with a plan, not a trolley

The biggest cause of kitchen waste is shopping without a clear idea of what you are actually going to cook. Before you head out, spend ten minutes working out your week. Look at what is already in the fridge, the freezer and the cupboards, then build your meals around those ingredients rather than starting from scratch.

A flexible plan works better than a rigid one. Rather than assigning a specific dish to every night, think in themes: a roast on Sunday, a curry on Tuesday, a soup or pasta midweek that can absorb whatever needs using up. Write a list and stick to it — the supermarket is designed to tempt you into buying more than you need.

• Check your fridge and cupboards before you write the list
• Plan meals that share ingredients, so nothing is bought for a single use
• Leave one or two nights free for leftovers or a "use it up" dinner
• Shop little and often if you can — a smaller fridge turnover means less spoilage

Store it properly and it will last longer

Where and how you store food has a huge effect on how long it keeps. A few small adjustments can add days to your ingredients.

Keep your fridge at or below 5°C — most are set too warm. Herbs like parsley and coriander last far longer if you treat them like flowers: trim the stems, stand them in a glass of water, and cover loosely with a bag. Salad leaves benefit from a clean tea towel or kitchen paper in the bag to soak up moisture. Potatoes, onions, garlic and bananas are better off out of the fridge in a cool, dark spot, and onions and potatoes should be kept apart from each other.

Learn the difference between "use by" and "best before". Use by dates are about safety and should be respected. Best before dates are about quality — a yoghurt or a bag of pasta a few days past its date is very often perfectly fine. Your nose and eyes are better judges than a printed number in most cases.

Make your freezer work harder

The freezer is the single best tool against waste, and most of us underuse it. Bread, milk, grated cheese, chopped herbs, leftover wine for cooking, and portions of stew or soup all freeze beautifully. If you have vegetables on the turn, blanch them briefly, cool them, and freeze in portions ready for a stir-fry or soup.

• Freeze in flat bags so portions stack neatly and defrost quickly
• Label everything with the contents and the date — mystery tubs never get eaten
• Freeze leftover herbs in olive oil in an ice cube tray for instant cooking flavour
• Keep a "bits" bag for vegetable trimmings to make stock later

Only freeze what is fresh, though. Freezing does not rescue food that is already past its best, it simply preserves it as it is.

Turn leftovers into tomorrow's dinner

Leftovers are not a punishment, they are a head start. A roast chicken can become sandwiches, a Thai-style noodle salad, and finally a pot of stock from the carcass. Roast vegetables fold into a frittata, a warm salad, or a pasta bake with a little cheese on top.

The trick is to deal with leftovers while you are still in the kitchen, not when you are tired and tempted to leave them. Decant them into a labelled container straight away, and eat them within a couple of days. Keep a shelf in the fridge specifically for "eat me first" items so nothing gets forgotten.

Cook with the whole ingredient

Some of the best cooking comes from using parts we usually throw away. Broccoli stalks, cauliflower leaves, carrot tops and beetroot greens are all delicious. Broccoli stalk sliced thinly makes a lovely slaw or stir-fry. Cauliflower leaves roast beautifully with oil and salt until crisp.

Stale bread is a treasure: blitz it into breadcrumbs, cube it into croutons, or tear it into a panzanella with tomatoes and olive oil. Overripe bananas become banana bread. Wilting spinach or herbs can be blitzed into a green sauce, folded into soups or stirred through pasta. A simple vegetable stock made from peelings, onion skins and herb stalks gives you a free base for risottos, soups and gravies all week.

Build small habits that stick

None of this has to be done all at once. Choose one habit this week — planning your shop, or labelling your freezer — and let it become automatic before adding another. A weekly "fridge audit" before you shop, a bowl on the counter for scraps destined for stock, and a regular soup night are all small things that quietly add up.

Reducing waste also tends to make you a better cook, because you start thinking creatively rather than following a list to the letter. A well-stocked, well-organised kitchen with a bit of imagination is the most sustainable one there is — and it saves you money every single week.