How to ensure a long-lasting friendship

It's been a number of years now that I have honestly been looking for the right formula to a true, sturdy friendship; one that can endure any shit that happens. I've had the transient friends, the ones that seem to be around for a year or so then vanished, the ones that dissipated after college and I get to see once a year at group gatherings, the friends that weren't really friends at all, but needed me for something or other, the ones that I lost touch with when they moved or I lost interest in their bullshit, the ones that were friends because it was easy or appropriate because our parents were friends, or they were friends with another friend.
Then I've had the ones that have really and truly been there. (You know who you are people. Much love to ya'! )The ones that are there time and time again. I have to say I am blessed to have a select few friends that are always there and even if I don't see them for weeks or months (as it happens sometimes with work and school and life) we can pick up right where we left off, the space around us full of conversation and laughter and pure unrestricted joy. So I've been analyzing the true friends...what makes them so reliable, what makes them so trustworthy and tolerable. What makes a good friendship? After much reflection, analysis and discussion, I've come up with the answer. Food. It's food that keeps us united and food that keeps us getting together. A friendship based on food can never go wrong. Friends that eat together, stay together. Don't laugh, this is for real. Think of those friends that you really just enjoy eating, drinking, pigging out with...the ones you are most comfortable around. The ones you can tell anything to over carrot cake, ice cream or cupcakes, mini pizza bagels, chips and salsa, a hot dog or sushi. And when you get full from laughing and eating and drinking, you feel ok unbuttoning your pants and exhaling in satisfaction. Those are the people that are worth having around. Those are ultimately the friends that are there when it's most inconvenient for them. Those are the friends worth having.