When I served in the army, there was always a desire to eat and there was no food. We prepared from what was at hand.
We take food, it's bread and sgushchenka (milk with sugar of dense consistency or condensed milk)
We take bread, cut off the top, open the tin can
Pour the contents out of the jar into the bread
We collect bread on spare parts and put in the refrigerator for a day to soak inside
We get it, cut it, and eat it. Children really like