Reference for Berakhot 6:7
הֵבִיאוּ לְפָנָיו מָלִיחַ בַּתְּחִלָּה וּפַת עִמּוֹ, מְבָרֵךְ עַל הַמָּלִיחַ וּפוֹטֵר אֶת הַפַּת, שֶׁהַפַּת טְפֵלָה לוֹ. זֶה הַכְּלָל, כֹּל שֶׁהוּא עִקָּר וְעִמּוֹ טְפֵלָה, מְבָרֵךְ עַל הָעִקָּר וּפוֹטֵר אֶת הַטְּפֵלָה:
If they brought before him maliach [anything maluach (salted)] in the beginning, and bread with it, he blesses over the maliach and exempts the bread; for the bread is ancillary to it. [One who had a large helping of especially sweet fruits eats something salty afterwards to "break" the sweetness in his body. And because he cannot eat the maliach by itself, he eats some bread with it. But the maliach by itself is primary, and the bread is ancillary to it.] This is the rule: In every instance of primary and ancillary, one blesses on the primary and exempts the ancillary.