I got the manga page for the BB again, same huge beef part. Some asparagus, parsley, "champignons de paris" (Agaricus bisporus), and maybe some potatoes but the picture is so dark it's hard to tell. I guess I had the same dissatisfaction, but didn't bother commenting in the manga thread since I was so late in starting the manga.
I wonder about the opportunity of asparagus and parsley in BB. Mushrooms (champignons de paris), I think I had it served and it did go well. Potatoes are a must.

In both cases, we have cauliflower I didn"t mention before. It's probably one of the most difficult vegetables to use, because it's either too powerful and in a bad way, or just tastes like water and you don't care... I'm not too sure about its use in BB.
In any case I do not remember having cauliflower in BB.

Regarding Erina and Souma, we have the classic opposition of style. One is a Genius and hardcore worker, always at the heart of the cooking battle right where it counts, centimeters away from the taste of everyday life customers who are the hardest to please because they want a fast, good, easy to digest while fulfiling and cheap meal. The other being a Genius with Deus Ex powers who is at the top of the top of everything food.
Thing is, they both need one another because they have to exchange the best they know to really access food Nirvana.
Souma needs refinement, needs to access exceptionnal ingredients/foods/recipes without forgeting his qualities.
Erina needs to understand there's lots of joy to be found even in seemingly simple foods.
She would never try a "Pasteis de Nata" -Portuguese Egg tart- or Lasagna. Both seem so simple and so vulgar to her.
But properly done, they need quite a level of control, you do not have room for mistake to make good ones. and good lasagna need lots of time to prepare... Good Pasteis need lots of precision, because you do not have lots of ingredients and it's easy to make average ones. Good ones on the other hand are hard to find.