What's Your Secret Ingredient?

I love the idea of a recipe having a secret ingredient. When the girls were little, I would steal away to the corner of the kitchen to add a secret ingredient (sugar) to my magic hiccup potion (water). My friend Andras puts a shot of bourbon in his scrambled eggs. My old co-worker Myles adds a spoonful of peanut butter to his chili. (Maybe, using that trick, Andy would've taken home a blue ribbon in the chili off?) Andy's dad used to make burgers on the grill (a recipe that has come to be known as "The Dadoo Special") and we're still trying to figure out what the heck he put in those patties. But I'm curious: What's your secret ingredient? What have I not been adding to my spaghetti sauces, stews, soups, chilis, eggs, pies, omelets, cakes, quesadillas, mashed potatoes, beans, roast chickens, that I should have been adding all along?