If you want to  make your friends aware about importance of food and not wasting the food,they ust be realised of their mistake and be told that most of the people in the Terrible poverty of India just dream of 3 Meals per day.They shoul be kept hungry for a day.THey would surely realise that wastage of food is worth wastage of LIFE
2 4 2
Start the conversation by exchanging pleasantries.
slowly introduce the problem.
x:y r u feeling dull today?
y:introduction of problem.
the restaurant owner can levy fine on customers who waste food.
if their serving size is big they could reduce it.
students can organize a group and talk about the importance of food.
they could do do step by step ordering so that the food won't be wasted.
conclude it by saying that the bell had rang we could discuss it  afterwards.
1 4 1