They're (look what we found) a range of ambient ready meals in pouches that can either be microwaved or heated on the hob. Approx cost £2 per pouch. Waitrose has the largest selection.
I find them a great convenience for when I'm camping
I bought two huge venison steaks at Waitrose on Sat afternoon. Reduced to £2.55 each. Griddled and finished in a red wine and mushroom sauce for Sunday lunch.
I bought a sample box after a post on here a few years ago when they first came out and had a special offer on. I thought they were very good for a long life meal, if a tad expensive.