The taco premise is simple: Layer inexpensive or decadent proteins, assorted vibrant toppings and "pack a punch" salsa and sauces inside a corn or flour tortilla and, voila, you have the makings for a delectable taco and the perfect fast meal. There's no limit, and as we found out, the extreme reaches of the imagination can create an unexpected tantalizing masterpiece. Regional flourishes, unusual ingredients, and new techniques keep pushing the taco envelope. It doesn't matter where you are in America, or if you are a carnivore or a vegan, a great taco experience is out there for you to discover. See what awaits and what some of the chefs have to say about their creations.