Genesis 25:30 says:
... הַלְעִיטֵנִי נָא מִן הָאָדֹם הָאָדֹם הַזֶּה ...
... "Pour into [me] some of this red, red [pottage] ..."
Why did Eisav feel the need to say "red" twice?
— Tol'dos Yitzchak, by Rav Yitzchak Karo (uncle of the Bes Yosef), in my own free translation
I think it just shows Eisav's infatuation with the food. The redness is was draws him to it. So the pasuk is describing his words in a way for us to understand his thoughts, i.e. "The red, red stuff," all I care about is how appetizing and juicy it looks.