Chabad.org — English translation + Rashi
Torah Temimah points to Menachos 104b.
E-Daf.com — Menachos 104b
HebrewBooks / Shas PDF
English: Rabbi Yitzchak said: Why is minchah distinguished that these five kinds of preparation are stated of it?
Observation of the five minchah forms — the Torah deliberately sets out five distinct preparations.
The Torah sets out five distinct cooked forms of minchah (solet, machavas, marcheshes, challos, rekikin). Rabbi Yitzchak’s question highlights that these five modes of preparation are not incidental but a deliberate feature of the flour-offering system.