Berachos6: 7
הֵבִיאוּ לְפָנָיו מָלִיחַ בַּתְּחִלָּה וּפַת עִמּוֹ — מְבָרֵךְ עַל הַמָּלִיחַ וּפוֹטֵר אֶת הַפַּת, שֶׁהַפַּת טְפֵלָה לוֹ. זֶה הַכְּלָל: כָּל שֶׁהוּא עִקָּר וְעִמּוֹ טְפֵלָה — מְבָרֵךְ עַל הָעִקָּר וּפוֹטֵר אֶת הַטְּפֵלָה.
[If] they brought before [someone] a salted food first, and bread with it, he recites a blessing on the salted food and discharges [the blessing obligation for] the bread, because the bread is subordinate to it. This is the rule: Whenever [a food] is primary, and [there is] a subordinate [food] with it, he recites a blessing on the primary [food] and discharges [the obligation for] the subordinate [food].