A “secondary” food that arrives in the middle of the meal

I would like to know the halachah in a case where, in the middle of a meal, food arrives from an unexpected source (and the food is being served on account of the meal). Likewise, regarding a primary and secondary food, when the secondary item comes from an unexpected place. Is one required to recite a berachah over it or not, and which berachah should be recited?

Shalom u’vracha 

No berachah is recited on it. 

Since it is secondary to the food over which a berachah has already been recited. 

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