What’s a good way to ban waste and a promotional slogan in the employee canteen?

Unlimited supply of small amounts and multiple times to eliminate shameful waste

Measures - a dedicated person will watch the bucket, and if there is any leakage of food, a firm penalty will be imposed, ranging from tens of yuan to upwards Ranging from 100 yuan! You don’t have to eat the dishes, but the rice must not be wasted! The execution must be strong enough, otherwise, all the words are said in vain!