If you're eating at an Australian restaurant called Wafu outside of Sydney, you better finish your plate—or pay a fine and not return. Chef Yukako Ichikawa is tired of the food waste people leave on their plates and the environmental impact, however unintentional, it all leaves behind.

Wafu, a restaurant for "guilty free Japanese cuisine," now gives a 30-percent discount to customers who eat all the food they order. Wafu makes its ethos pretty clear every step of the way, starting with its website. First request: "Please be mindful of the amount of food you order - consider ordering just the right amount, in harmony with your appetite!"

WATCH VIDEO: Sushi Nazi: Chef requires customers to eat everything or don't return!

Reuters reports that the restaurant has posted its policies outside the door—including the use of organic food free of gluten, dairy, sugar and eggs, and is completed with a warning: "To contribute toward creating a sustainable future we request a little more of our guests than most other restaurants."

Once inside, you'll find a menu that says, "Finishing your meal requires that everything is eaten except lemon slices, gari (sushi ginger) and wasabi," followed by—"Please also note that vegetables and salad on the side are NOT decorations; they are part of the meal too."

It may sound like a stretch to some, but considering that an estimated $48.2 billion of food goes to waste in the U.S. alone (which translates to between 30 and 40 percent of our food); that food makes up the third-largest waste stream in the U.S.; and that 300 million barrels of oil are wasted along with all that food, the world could do with a lot more restaurants (and homes) that prohibit food waste the way Wafu does.