@Liv @Inna22@Charles224 and others, food waste is a very important concern, as is waste in general.
It shows in the way we are all raised what our perceptions are and how we react to those part used jars / packets of food, waste in general.
If we think of starving children, those who had relations suffer in war torn years & real hardships in life it makes one think differently and perhaps appreciate those things.
Add to the mix, we do have water to wash our hands in most countries and towels to dry our hands and exercise commonsense with cross contamination.
Sometimes people have more money than sense in the world whereas others appreciate and look after the environment.
Think where products end up when you turf them into the garbage bin, usually at a rubbish tip that was once natural wilderness and animal and natures wonderland....where will those species go for survival, if they survive the human race and lack of foresight?
" One person's rubbish is another treasure".
Reduce, Reuse, recycle.
As an aside, those empty plastic ice-cream containers & glass jars & bottles can be washed & dried, recycled & sold online or given to charity for other uses.
It amazes me every time I've accumulated a dozen empty ice-cream containers and pop an advertisement online & bingo they are sold within a week to someone who appreciates them.
One lot was used for a university irrigation experiment, and another lot are on there way.
Perhaps encourage guests to take things with them when partially used.
Oh & I think it was @Ann72 who did a video that's in CC tucking into muffins that were left behind.