You can usually get a bite to eat on each corner of the most populated areas, but use your best judgment. The safest food is fried, boiled or thoroughly cooked. Avoid stuff that has minced meat at all costs, you don’t know what they put in there and it goes bad incredibly fast. Same goes for natural juices, if they’re squeezed right before your eyes they should be safe, otherwise…
Cuban sandwich (20 CUP) – to be avoided – it’s just a soft bread bun/roll – pan suave – with questionable meat inside and nothing else. It’s not your Cuban Sandwich back home with ham, roasted pork, cheese and pickles. The same goes for Pork Burgers (Hamburguesa de Cerdo).
Cuban Pizza (10 CUP) – is an affront to pizza anywhere, they can’t even get it to be round, most end up square-ish and tasting awful either on the streets or in restaurants.
Churros (0.50 CUC) – also called a Spanish doughnut or Mexican Fries, is a fried-dough pastry. They are served with sprinkled sugar in Cuba.
Roasted Peanuts – they don’t taste the same as peanuts in Europe or USA, but Cubans seem to like them. Street vendors sell them in a paper shell. (10 CUP)
Pie de Coco – it’s mainly sweet shredded coconut baked into a pie crust for less than 10 CUP.
Ice cream – from soviet style ice cream machines for 1CUP.
You can also have some varieties of cakes with cream toppings they keep in the sun all day because they don’t’ have refrigerated machines. I would pass on these.