Heres an interesting (but unlikely option)
If you have a back garden you could get some quail.
I only have 4 at the momentand their food doesnt cost much
I have them because i love birds but also i get breakfast that cost pence per meal
financial
20kg of quail food 10-15£
food per day per quail = 0.02kg
20kg of quail food will last 1000 days for one quail
for my 4 quail this will last 250 days or at worst 200 days
each quail can lay 250 ish eggs per year
so about 1000 eggs for 10-15kg food
id say it takes 4 eggs to make a small sandwich

Why are people suggesting things like chicken and mince? Even the cheapest cuts of chicken, e.g. wings, drumsticks or even whole chickens etc, are still ~£1 for a meal's worth. A can of beans will cost you 20-30p for a meal's worth.
Actually, M&S do large chicken leg/thighs 3 packs of 4 for £10 (12 legs/thighs). We use one per person
DO NOT buy this recipe book whatever you do! I made the unfortunate MISTAKE of buying it to make Christmas dinner a little more interesting for the family this year. I earnestly followed the recipes and was very excited to offer the star recipe `Spunkulicious Pie' to the in-laws as a special treat. All of the men in my immediate family contributed to it. Even Granddad! We didn't even know he had it in him. The shared solidarity of a collective experience made it seem even more special. It had that delicate smell of ball sack aroma when it came out of the oven just like the book said BUT! A few hours later everybody became violently ill. The book says you can reheat the pie but now I read somewhere else that this is disastrous because the heat mutates the semen. We all spent Christmas day at the NHS walk in centre and were diagnosed with the rare illness known as CONSPUNCTIVITIS. It ruined our whole Christmas and I want my money back!!!!
I gave it 2 stars because it smelt nice and the men felt happy at first.
quail don really brood their own eggs in uk. Besides much better than shop bought eggs. Eggs are also obviously a brilliant source of nutrients etc
I already have 2 eggs today to collect

If your that hard up & missing meals pop a message in trust (with your address) & I'll get you a hamper delivered to you with a few things.
If everyone in this thread donated a quid to the OP he'd be set to eat well for the month easily.
I've got a spare £1, anyone else?

So ~82p for chicken, vs ~20p for a can of beans for a similar quantity of protein?
So ~82p for chicken, vs ~20p for a can of beans for a similar quantity of protein?
Order a takeaway curry and feast for one night.