I dug out a classic of the kitchen yesterday, the Goode Kitchen, by Shirley Goode. She was the original queen of the frugal kitchen and, even though this book is from the 1980s, a lot of her advice is still relevant now. If you can find yourself a secondhand copy I recommend it.
She talks about how to cost the food you prepare like a professional chef, so you can accurately work out how much individual meals cost to make. She suggests that when you buy ingredients you take the overall cost and divide it up. For example, if you take a bag of flour, divide the cost of it by the number of grams in the bag to work out how much, say 100g, costs. Then write this on the bag. You can do the same with a single egg, 100g of cheese, 100 ml of milk, etc. You can accurately calculate the cost of every recipe you make and see if you can make it any cheaper! I certainly intend to start doing this from now on.
There is a recipe in the book called lamb and lentil casserole, which is great for stretching a small amount of meat. I adapted this and used pork instead, as it is cheaper than lamb, and added a few leeks as I am growing them in the garden. I used a bit more liquid than in the original recipe because it seemed a bit dry, and more potatoes to make it more substantial. I think this would work well in the slow cooker so I will use that next time.
600ml good beef stock
100g green lentils
1 small onion, chopped
2 small leeks, washed and sliced
2 carrots, sliced
1 large potato per person, sliced
350g pork, cubed
Salt and pepper
Preheat oven to 180C. Bring the stock to the boil, put the lentils in a large casserole dish and pour the stock over. Brown the meat in a pan, then add the onions and leeks and soften. Place on top of the lentils with all the other veg. Season and stir, then cover and cook in the oven for about 1 hr 15. Check there is enough stock after 45 minutes and add more if necessary. Serve with a green vegetable.