Secret Recipes

Heard this topic on the radio the other day - do you have a recipe that you love to make for people but hate to reveal? I don't but I was thinking that maybe I should. When someone asks for a recipe I am so flattered that I eagerly give it out. But I need to hold back a little. Be more mysterious. After all, half the art of being a good cook is being a good recipe finder.
Either I should keep my recipes secret, or I should give out recipes with slight tweaks in the proportions. Just so no one else can make them as good as I can. Because cooking is a competition after all.