@Blip
The lamb is the only expensive bit.
I can get it pretty cheap at the butchers if you ask for stew cuts, usually about £6 p/kg. I have used 2kg of Waitrose (I know?!) stewing lamb, which is £16 the lot, to make 2 batches for 5 people each time. The rest of the ingredients come in at about £4.
So on butchers meat, £16 all in for ten portions, and using Waitrose meat, £20 for ten portions.
I think even at £2 a head, it's a cheap meal, with little effort, packed with veg, grains, meat, carbs. At £1.60 a head, it's a great dish.
It's not quite the £1 a head Sausage and Fennel ragu I posted earlier (which incidentally we are having tonight) but once you get lower than £1-2 per head, I feel you are verging into "not a meal" territory. We could eat supernoodles with chopped up hotdogs in for a bit less, of course, but I think you need to strike a balance between eating cheaply but still providing a good nutritious meal.
Sausage plait as mentioned upthread is also uber cheap: (Lidl Prices)
One sheet ready rolled puff pastry - 79p
2 x 350g packs sausage meat (I use butchers) £3
Large apple, chopped - 40p
Half bag Echalion Shallots, chopped - 20p
Good handful fresh breadcrumbs (leave the end bits from your sliced loaf out overnight to go stale, and whizz in blender) - 20p
2 tsp dried sage - 20p
1tsp lazy garlic - 10p
1 egg, beaten - 20p
Total £5.09
Fry shallots, garlic, apple and sage. Wait to cool, mix into sausage meat. Mix in bread crumbs. Roll into sausage, plonk on puff pastry, cut ribbons around it and fold over to form plait. Brush with egg wash. Oven 180c for 35mins.
Serve with salad (bistro salad, 79p) and roasted miniature potatoes, (59p), taking total cost to £6.47 for five servings. £1.29 per head