The proper feeding of kitchen scraps has something of a method to it. Let me summarize....
1. All kitchen scraps should be lightly cooked into a sort of stew, first. Meat, bacon, fish, poultry, cooked eggs, vegetables, potatoes, rice, scraps, you name it, can all go into the pot. Just collect it over a week and make a stew of it on the weekend. Cook it for 20 minutes or so. Do not use rotten or spoiled foodstuffs.
2. Keep the stew in the icebox until wanted. You may wish to split it into daily measures, as you will want to use it up before the next batch is made.
3. To prepare for feeding, warm the "kitchen stew" over the stove (or microwave) and mix it with about an equal measure of the regular feed. Add just enough warm water to the mix to make a damp mash. Include any left over bread stumps, stale crackers, oatmeal or other cereal products as may be available.
4. Feed this mix as the last feeding of the day, before the birds go to roost. This sustains them through the night.
You may also make this the first feeding, to get them going ion the morning, It is particularly welcome on winter mornings, for it's warming effects.
This is taken from the 1946 edition of "How To Grow Your Own Food."