If someone start eating cake in one location he/she can make על המחיה in a totally different location (from which the first cannot be seen) if one continues eating there.
Does the food that is continued eating have to be from the 5 grains - חמשת מיני דגן, or can it be anything? What about rice, for example, the person ate cake in one house and then continued eating rice in another house?
Assume that this person had in mind to continue eating in the other location when making the first Mezonos.
