Completing Meah Brachos on Shabbos

“ויטע אשל בבאר שבע ויקרא שם בשם ה’ א-ל עולם” (כא לג)

Harav Asher Anschel Jungreis, the Rav of Gyongyos, Hungary:

During the six days of the week, a person can easily reach the quota of 100 brachos, but on Shabbos, when he is 20 brachos short (see Bais Yosef, Orach Chaim 46) Chazal say (Menachos 43b) that he is able to complete them by reciting brachos on eating fruits and other confections.

We can say that this is why Avraham planted an אשל so that — ויקרא שם בשם ה’ א-ל עולם — through the brachah on its fruits, they could complete the brachos that were missing on Shabbos. We can bring an allusion to this from the fact that the word שבע is an acronym for שבת ברכות עשרים.