We got it from a neighbor who got it from the government. That and the peanut butter you had to stir up before using it. It was good in macaroni and cheese, grilled cheese sandwiches and on burgers. The peanut butter was good for sandwiches but not often. We ate it because it was on the table. I guess the neighbors didn't like either very much but us kids would eat whatever mom made for us.
My wife bought some Honey Nut Cheerios and they are not all round like they used to be. About half are heart-shaped. I guess it's so people think they are good for you. Carb loaded sugar bombs can't be healthy and good for your heart no matter what the commercials tell you.
I used those once in a while when I was in grade school. I was playing with radio circuits back then.
I stopped playing when IC chips came out - except for making repairs to my first computer. The computer center (Radio Shack) couldn't fix it so I did.
Growing up a friend we went to church with was a TV repairman. he had a smaller version of that.
When I got out of electronic school I got a job at a repair shop and that had a suitcase version for what few tube type sets we worked on.