We shop all at aldi and lidl. We eat alot of chicken breast so either buy 2.5kg deals from butcher or by the kilo bag frozen but use 1 breast for a meal like a curry, fajitas, stir fry.
Aldi have super 6 which we base meals around or that's the kids fruit that week.
Aldi reduce food first thing so get there for opening go to meat and fish and then fruit n veg and get all 50% off bits, my boys love salmon they only get it when reduced but we build a stash in freezer this way.
Lidl do the fruit n veg box for £1.50 by the tills needs using in next couple days and hit n miss if available but I had choice of 10 at lunchtime yesterday. Mine had cauliflower (using for biryani), red pepper chopped for freezer, 2 mangos chopped and eaten in my breakfast, 1 potato, 1 carrot, 1 pear, 1 apple, 1 banana, 3 plums, a lettuce.
Take the kids on a long woodland walk you will find blackberries growing ready to pick now and if lucky some wild raspberries but coming to end of season and birds may have beaten you to them. Often lots cherry trees and plum trees in wild too but birds mostly get there first.
Look up a recipe for baked eggs its great with pasta, rice or crusty bread.
Look for fareshare style community markets or junk food projects food that's gone past bbe date but perfectly edible where shops give to fareshare and places like salvation army and childrens centres have market stalls you go take what you want and put a donation in the pot if you can. No judgement and it's for everyone to prevent waste its not a food bank so dont need referrals.
Biggest tip is utilise the freezer and waste nothing.
Use the oven to its max when on so going to use oven for dinner can you batch cook something else for next day or makes some cakes or a crumble.
I dont know how much we spend on food we throw away minimal food ie toddler left overs and other than chicken breast try not to buy meat at full price we use the chest freezer and buy reduced meat when we see it.