Sirloin burger with buttered and grilled bun, balsamic vinegar caramelized onion slice, lettuce and beautiful perfect bright red tomato slice at Portofino's.
Sirloin burger with buttered and grilled bun, balsamic vinegar caramelized onion slice, lettuce and beautiful perfect bright red tomato slice at Portofino's. © Mark Cornelison
Sirloin burger with buttered and grilled bun, balsamic vinegar caramelized onion slice, lettuce and beautiful perfect bright red tomato slice at Portofino's. © Mark Cornelison

5 burgers worthy of a 21-bun salute

July 22, 2010 09:30 AM

UPDATED November 10, 2015 10:25 AM

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