My current favorite way to be frugal has nothing to do with food, but I’ll share it anyway.
Rubber bands and hand soap.
My kids – like many kids under the age of 12 – tend to use WAY too much hand soap. And in my neck of the woods, hand soap is NOT cheap! I cannot be the hand-washing-police all the time, so I had to come up with a way to keep the soap-pumping down to a minimum. My solution was SIMPLE and very, very frugal. I used a rubber band (taken from my latest bundle of celery) and wrapped it around the base of the soap pump. This limits how far one can push the pump down, thereby limiting the amount of soap consumed in one pump! Voila! I think this has probably reduced our hand soap usage by at least half.