וּמִסַּ֨ל הַמַּצּ֜וֹת אֲשֶׁ֣ר ׀ לִפְנֵ֣י יְהוָ֗ה לָ֠קַח חַלַּ֨ת מַצָּ֤ה אַחַת֙ וְֽחַלַּ֨ת לֶ֥חֶם שֶׁ֛מֶן אַחַ֖ת וְרָקִ֣יק אֶחָ֑ד וַיָּ֙שֶׂם֙ עַל־הַ֣חֲלָבִ֔ים וְעַ֖ל שׁ֥וֹק הַיָּמִֽין׃
他又從永恆者面前那籃無酵餅中，取出一個無酵餅、一個用油調和的餅和一個薄餅，放在那些脂肪上和右腿上。
Rashbam
ולחם מצות, is called לחם. This “bread,” though described as “unleavened,” contained oil as this is the same “bread” described as לחם שמן in Leviticus 8,26 where the inauguration rites are described. The meaning of the various other flour-based items mentioned here are described in detail in Menachot folios 74 and 75. There were a total of ten such flour-based products of each category listed here.
English Explanation of Mishnah Menachot
Introduction Our mishnah deals with two other types of minhah offerings that are similar in amount to the todah: the “basket of matzot” brought on the day that the priests were first consecrated to serve in the Tabernacle (Leviticus 8:26) and the “basket of matzot” brought by the Nazirite (Numbers 6:15).
Ibn Ezra
They put the fats with the kidneys and the lobe of the liver, as I have explained [comment on 8:26].