We are doing OK at the moment, but I credit it to the freezer, storecupboard and pressure cooker.
Dried goods (rice, beans, pulses) are bought in bulk, preferably on offer. I tend to use Spaghetti for a lot of things as it's the cheapest pasta shape at the moment.
I check what we've got in the fridge to make a meal plan around. Then see what's on offer in our supermarket of choice (generally aldi).
Meals are planned weekly based on the offers (eat seasonally) and what weve got in. And bulked with veg - I add chickpeas and frozen spinach to curries as standard.
We eat more chicken mince now (made into meatballs and served with pasta.). Rarely do we have a chicken breast or a steak each. Most meals with meat (my family complain about "vegetarian dinners" when they perceive there not to be enough meat per portion. They say it to be "funny", but it gets right on my tits) involved the meat being chopped so it goes further. The one meal they don't complain about is pizza - since we were lucky enough to go to Italy, they now enjoy a margherita! That's our weekly summer meat free meal.
I've used half pork mince and half beef mince for bolognese and the like for years. Thankfully my family enjoy it.
Nothing is wasted. Meat bones are roasted and then frozen with washed veg peels until I have enough to make a pressure cookerful of stock. I then boil that down so its easier to store, again in the freezer. Older bread becomes pangratatto as a topping for pasta bakes or is dehydrated and is a coating for meat/fish. Older beg becomes soup, etc.
We do grow some fruit and veg, because we enjoy it and the flavour is so much better. I save seeds from bought tomatoes/peppers (and then save seeds from the resulting veg). They can be grown on a sunny windowsill. Ditto peashoots can be grown by planting dried marrowfat peas. They're delicious! Strawberries and framberries grow like weeds, as do raspberries. If you know any gardeners, I'm sure they'd be delighted to foist some off share the new plants with you.
I stock up when things are on offer - joints at Christmas and Easter. I have access to cash and carries and buy massive turkey crowns, which gets us through a LOT of weekly roasts for 4/kg.
I use an app called check out smart where they put deals that you can buy and get cashback for. There aren't always great deals but I've jjust ecently cashed out £50.
We use costco a lot and stock up on their deals. Their babybels, pepperamis and other lunchbox bits are significantly cheaper than other supermarkets, even when full price. It's worth trying if you know someone with access. Its ever so easy to get carried away in costco though! But if you keep an eye on deals and shop to the list, you'll be OK.
Unfortunately, you have to have a bit of money to start saving money and I so wish it wasn't like this.