Halacha: What Blessing Do You Say on Kohlrabi?

On the kohlrabi we say the blessing "ha'adama" (the initial blessing)

After eating, we say "boreh nefashot" (the final blessing)

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The amount of food required to necessitate a final blessing (based on "Daily Halacha" from the rulings of Maran Rabbi Ovadia Yosef of blessed memory):

For anything a person eats, they must say an "initial blessing," such as the blessing "shehakol" or "ha'etz." Even if they eat only a little of that food, they must bless it, as long as they intend to eat it. (But if they are only tasting it to adjust its seasoning and the like, they do not bless this tasting at all). Therefore, one who chews flavored gum, although they swallow only a very small amount, still must bless for enjoying the gum's flavor. Likewise, when drinking something, they must bless it even if they are drinking just a drop of that beverage.

However, this only applies to the initial blessing; a final blessing is only said when one has eaten what is considered a "significant amount," which is the measurement of an "olive size," approximately twenty-seven grams, and for drinking, the measurement is a "revi'it," which is eighty-one grams.

Additionally, the eating or drinking must occur within a timeframe that allows them to be considered as one sequence. Thus, if a person eats an olive-sized piece of bread over an entire day, bit by bit, they obviously cannot say the "grace after meals." The eating of the olive-sized amount should occur within a timeframe called "eating a pras," about which poskim have differed, with some saying it is five minutes and others saying about seven and a half minutes (and there are additional opinions). Therefore, one should always be careful to eat an olive size (especially during Shabbat meals) within four and a half minutes to fulfill all opinions.

Regarding a final blessing on beverages, one must drink a revi'it (eighty-one grams) in one go; if they drink and pause between sips, they do not say a final blessing at all. Therefore, one who drinks soup with a spoon does not say a final blessing on that soup, as they have not drunk a revi'it in one go, and similarly, one who drinks coffee or tea while they are hot does not say a final blessing because they cannot drink it in one go.