Being a grown-up has its perks: No one can tell you when to go to bed, when to stop shopping, or why you shouldn't eat dessert for dinner. It's great, right? Except that the 9-to-5 life doesn't include recess. And while employers may never grant mandatory frolic time (c'mon, HR—get on that), the closest thing we've found to delight our inner child and actually make us look forward to the workday is the lunchtime gathering of food trucks.Ever since these trendy meals on wheels began popping up across the District and spreading to the 'burbs, the ol' brown bag lunch has started to feel dated and downright impractical—why pack a soggy sandwich when you have an excuse to get out in the sunshine, grab an extra-cheap bite, and chill out in the park for a hot second? So, because the fight for the title of Top Food Truck is as hotly contested as the battle for the GOP nom, we did all the groundwork necessary to bring you our official food-truck cheat sheet. Behold: everything you need to know about the most delish curbside cuisine in the area, including where to find them and what to order.