Porto's calorie-laden specialty may have been patterned after a French croque monsieuer, but really belongs in its own food group. The Francesinha is a deliciously sinful must-try here, best enjoyed with a side of hand-cut fries and a cool beer.
At O Golfinho, the dish is the real deal: thin-sliced meats and sausage, layered with cheese and perched on a slice of bread, everything topped with a fried egg. A true original, O Golfinho's Francesinha is bathed in the "secret sauce" of proprietor Alberto Fernando da Silva. Worth busting a diet for!
Tip: If you're not up for a 2,000-calorie lunch, a Francesinha is perfect for sharing. Just ask for an extra portion of sauce, and pour it over as you go along, to keep everything warm.