Doonesbury by Garry Trudeau for May 15, 1972
Zonker: Dum-de dum-de doo! Mike: What's for dinner, Zonker? Zonker: Macrochaotic salad! Fresh from le garden....m-m-m good, folks! Mike: Zonker, the lettuce is dirty! Zonker: Maybe, but it's clean dirt! Ecologically, pure dirt! No chemical additives - you'll love it! Fini! Mere de la terre salad! Rufus: Macdonald's? Mike: Fine with me.