"The most crucial component of any sandwich is balance: of flavors, of textures, of bread to filling," Rob Patronite and Robin Raisfeld write as a preface to their list of New York's 101 best sandwiches. Not to be outdone, and since San Francisco's love affair with the sandwich is also in full bloom, Grub Street compiled a list of the 50 most noteworthy local examples. Our city's eclectic character is reflected in its range of sandwiches, from the array of truly delicious vegetarian offerings (Wexler's smoked mushroom Reuben), to the bold flavors of the seared squid and sardine lunch at Barbacco or the French-i-fied take on the BLT at Zazie. In a city this delicious it's hard to choose a favorite. Narrow it down yourself by looking through our sandwich slideshow, then enter a a Grub Street Sandwich-inspired Sweepstakes for a chance to win fantastic, edible prizes.