Chapter 57: 1-3
Foods Brought after Original Serving
1. If a person recited a blessing for bread without having the intention of eating more than what was prepared for him - e.g., he brought a loaf of bread or a roll and thought that it would be sufficient, and afterwards desired to eat more and sent others to buy it for him - he is required to recite a blessing hamotzi for the bread which was brought to him afterwards, since it is as if he has changed his mind. This applies even if some of the bread for which he had originally recited the blessing remains before him.
However, if a person has bread at home and cuts a portion for himself which he thinks will be sufficient, and afterwards, desires to eat more and cuts an additional portion for himself, he is not considered to have changed his mind and is not required to recite a second blessing, since this is common practice. This decision applies even if none of the original bread remains.
2. The following rules apply when a person recited a blessing over fruit, and afterwards other fruit was served to him. If, when he recited the blessing, he had the intention to include everything that he would be served, then he does not have to recite a blessing for the fruit which is served later. This applies even when none of the original fruit remains, and the fruit served later is of a different type; so long as they both require the same blessing [the blessing need not be repeated].
However, if the person actually changes his mind - i.e., originally, he only had in mind to eat that which was placed before him, and later he changed his mind and decided to eat more - than he is required to recite a second blessing. This applies even if the fruit served later is of the same type as the original fruit, and some of the original fruit remains when the second fruit is served.
3. [The following rules apply] if, originally, the person's intention was undefined, without tending in either direction. If none of the original fruit remained when the other fruit was served to him, he is required to recite a second blessing.*
* {The Misgeres Hashulchon (2) questions this decision when the fruit served afterwards is of the same species as the fruit over which the original blessing was recited. In such a situation, even when, originally, the blessing was recited without any specific intention and none of that fruit remained, there is still doubt whether or not a second blessing should be recited or not. See also Mishnoh B'rurah 206:20,22.}
However, if some of the original fruit remains, there is an unresolved question among the Halachic authorities whether or not one is required to recite a second blessing. Therefore, when reciting a blessing, it is proper to be careful to have the intention of eating whatever one will be served. Should one fail to have this in mind and recite the blessing without any specific intention, one should withhold from eating more than what one was originally served, because of the question that exists regarding the recitation of the blessing.
