Ferran Adria is widely considered to be the most innovative, most influential, and indeed the greatest chef in the world today. Culinary giants like Thomas Keller venerate him. El Bulli, the restaurant where he creates his masterpieces, has become a pilgrimage site of sorts; food connoisseurs from around the world journey down a dizzying coastal road to Roses, Spain to experience his unconventional tasting menu -- often consisting of 25 or more courses. But if you want a reservation, get in line.