I teach teenagers.
Can you get them to research where foods come from?
I once had a conversation where a teenager said, "Uhg, who'd eat a bird?"
So I asked if she ate chicken, which she did, but didn't know it was a bird.
I've also had teenagers who didn't know soya milk and dairy milk were different things and that one came from a cow.
Also that mash and chips are both made from potatoes and do not always come frozen or in a packet.
I hated this at school, RC girls school so we had increasing amounts of 'Domestic Science' and 'Needlework' until in 3rd year (now year 9) we had a 1/2 day of DS and a 1/2 day of needlework. How much time do you have OP
I spent a term tacking a dress and then unpicking it.
One thing we did was make a skirt, which could be made in uniform colours and worn as uniform, so the parent had to pay for the material and thread but you ended up with something useful.
Assuming you have boys as well as girls they boys might not be keen on a skirt and I know trousers are more difficult.
Depending on the level of deprivation your school is in, another thing my old school did was that you could 'sell' your food to a teacher, so either you brought in the ingredients and then sold the shepherd's pie or Christmas cake to a teacher, or a teacher would bring in the ingredients, you cooked it and then handed the finished product back.
Looking back now I'm not sure the teachers actually ate the food or it was just a way of subsidising the poorer kids.
We did an awful lot of mince dishes and there was an emphasis on doing things from scratch, so using tinned food in with fresh to make something edible and economic I sometimes cook chicken with condensed mushroom soup and creme fraiche.
Could you do a 'mystery box' challenge? Obviously not week 1 of year 7. But for older kids so they learn to look in the fridge and cupboards and make something.