I discovered tomatillos on a trip to Mexico in 1973. I saw them in an outdoor market and they were so unusual looking, like little green tomatoes enclosed in a husk. They looked like miniature Chinese lanterns.
I bought some and asked the lady what to do with them (in very bad Spanish.)
I didn't understand exactly what she was telling me, but I know it included onions, garlic and chicken.
When I got back home, I looked for recipes and started to collect quite a few.