Halacha: What Blessing Do You Say on Grapefruit?

The blessing for grapefruit is ha'etz (first blessing)

At the end of eating, you say borei nefashot (last blessing)

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The amount one must eat to be obligated to recite a last blessing (according to "Daily Halacha" from the rulings of Maran Rabbi Ovadia Yosef ZT"L):

For anything a person eats, they must recite an "initial blessing," such as the blessing "shehakol" or "ha'etz". Even if one only eats a small amount of the food, they are obligated to bless over it, as long as they intend to consume it. (However, if tasting the food is merely to adjust its seasoning, no blessing is necessary.) Therefore, someone who chews flavored gum, even though they swallow very little, must bless the flavor they experience from the gum. Similarly, if one drinks anything, they should bless it even if consuming just a small taste of it.

However, this applies only to the initial blessing. The last blessing is only recited upon eating a "significant amount," defined as the size of an olive, or twenty-seven grams, and in drinking, the amount is a "revi'it," which is eighty-one grams.

Additionally, the eating or drinking must occur within a specific timeframe so they come together. For example, if someone eats the quantity of an olive-sized piece of bread over an entire day, piece by piece, they certainly cannot recite the Grace After Meals. Instead, consuming the olive-sized quantity must occur within the timeframe of "eating a portion," and opinions differ on how long this is, with some saying five minutes and others, about seven and a half minutes (and there are other opinions). Therefore, it is wise to always consume the olive-sized amount (especially during Shabbat meals) within four and a half minutes to satisfy all interpretations.

Regarding the last blessing on drinks, one must drink a revi'it (which is eighty-one grams) at once. If they paused between sips, no last blessing is recited. Therefore, someone sipping soup with a spoon does not recite a last blessing since they did not consume a revi'it at once. The same goes for someone drinking hot coffee or tea; no last blessing is said since they cannot drink it all at once.