Rif Brachot 27b

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27b

{Brachot 38b continued}
one needs to bless before and after, but if there is not an olive's measure, beforehand one must bless for it is forbidden to benefit from this world without a blessing, but afterwards he does not need a blessing.

{Brachot 39a}
Rav Ashi said: When we were in the house of Rav Kahana, he told us: this broth of beets, one blesses over it Borei Peri HaAdama, while this broth of turnips is Borei Minei Mezonot. He backtracked and said this and that are Borei Peri HaAdama, and this that they put in flour {into the broth} is only to make it cohere better.

And water of beets and water of turnips, and water of aniseed, all of them are Borei Peri HaAdama, for we establish that the water of boiled foods are like the boiled foods.

Rav Chiyya bar Ashi cited Rav: Over a dry crust which has been put in a pot [to soak], the blessing is HaMotzi.
And this opinion argues with Rabbi Chiyya, who says: The bread should be broken with the conclusion of the blessing. {and here, since the bread was already broken, one would say Shehakol.}

Rava argued on this: Why in the case of dry crust {is HaMotzi not said}? Because when the blessing is concluded, it is concluded over a broken piece. But when it is said over a loaf, it finishes over a broken piece!
{Brachot 39b}
Rather, Rav said: the blessing should be said and then the loaf should be broken.

(And the halacha is like Rabbi Chiyya bar Ashi) And the halacha is {like Rabbi Chiyya according) to Rava.
{and see the Bach's corrections for this girsa}