If eating a single grape etc and one wants to avoid questions of bracha achrona, does biting the grape in half first suffice to render it not whole? Does it matter if that first half is or is not swallowed before eating the rest of the grape?
If it is cut before putting it into your mouth, or even if you bit off a part and then put the rest into your mouth it will not be considered a whole item and you will not have any question of a bracha achrona if it was smaller than a kzayis. Biting the grape while it is inside your mouth will not make not a “beria”, since it was put into your mouth when it was whole. This would apply even if the first half was not swallowed before putting the second half into your mouth.
M:B 210-6,8, Ben Ish Chai ( Matos 5), OHr L’tzion 14-28, Har Tzvi 106, Sharei Habracha 14-18,