Blessing: What to Recite Over a Quince?

On the quince, the initial blessing is the "tree" blessing

At the end of eating, recite "Borei Nefashot" (the final blessing)

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The amount eaten to be obligated for a final blessing (from "Halacha Yomit" based on rulings of Maran Rabbi Ovadia Yosef ztz"l):

For anything a person eats, they must recite an "initial blessing," such as "Shehakol" or "Ha'etz." Even if only eating a small amount of that food, one is required to say a blessing if the intent is to eat. (However, if one only intends to taste the food to adjust its seasoning, no blessing is recited.) Therefore, someone who chews flavored gum, even if swallowing only a tiny amount, must bless for the enjoyment of the taste. Similarly, when drinking, a person must bless even if drinking only a single drop of the beverage.

However, all this pertains only to the initial blessing. A final blessing is recited only after eating a "significant amount" of food, defined as the amount of a "k'zayit," meaning 27 grams. For drinking, the amount is a "revi'it," which is 81 grams.

Additionally, the eating or drinking must occur within a timeframe where it combines into an action. If a person eats a "k'zayit" of bread crumb by crumb throughout the day, they cannot say the Grace After Meals. It must be a "k'zayit" within the time of "Achilat Pras," a point of dispute among authorities, with some saying it is five minutes and others about seven and a half. It is best always to eat a "k'zayit" within four and a half minutes to fulfill all opinions, especially at Shabbat meals.

As for a final blessing on beverages, one must drink a "revi'it" of the beverage (81 grams) at once. If sips are spaced apart, no final blessing is recited. Therefore, someone sipping soup with a spoon doesn't recite a final blessing on it, nor do those drinking hot coffee or tea, as they can't consume it all at once.​