The spell does not say, so it is up to your DM
You create 45 pounds of food and 30 gallons of water...the food is bland but nourishing...
There is no indication in the spell what the food consists of. As such, you must talk with your DM and decide if it makes sense for the spell to allow for the creation of bland but nourishing meat.
As Jeremy Crawford has said:
A spell's text details the spell's effects—the only thing the spell does. Any additional effects are up to the DM.
In my opinion there is nothing game-breaking about allowing a food-creating spell to create some sort of meat. It is, after all, the purpose of the spell to create things to eat. In other words, I see no reason that would justify restricting player freedom and choice in this case.
"Nourishing" food could even make meat vs not-meat irrelevant
In fact, I think it is even reasonable to read nourishing ("containing substances necessary for growth, health, and good condition") as indicating that it doesn't even matter. If the food is nourishing for anybody that eats it, then even a carnivore would be able to subsist on it no matter what form it takes. (If a carnivore can eat something and find it nourishing isn't it essentially meat?) As a DM, this means that I would see nothing wrong with allowing the player to theme the food/water however they like.
However your DM may disagree. Talk with them and work it out.