If a person has washed and said hamotzei and then at the end of the meal they decide unexpectedly to eat something else not related to the Motzei meal, should another beracha be made for that new food item or is the new food item covered by the original Motzei?
Please send sources.
All food that is eaten during a meal is covered by the Hamotzei berachah, provided that the food is part of the meal.
Poskim dispute the status of food that arrived during the meal (or after the meal) from an unexpected source, such as from an unexpected guest who dropped in with some food. The general consensus is that a new berachah is made for such food.
However, for food that was at home the assumption is that this is “expected” because a person might always decide to eat something he has at home, and therefore no new berachah is made.
For the question of food coming from outside see Orach Chaim 177:5 in the Shulchan Aruch and Rema, and for explanations of the Rema see the Aruch HaShulchan and Mishnah Berurah 177:17 (citing from Taz); see however Tehillah LeDavid 177:4. This subject of dispute clearly indicates that for anything else (meaning, for food that doesn’t arrive from an unexpected source) one does not recite a new berachah; see Shulchan Aruch 177:1 and commentaries.