Vasddoo is making a meal just for Izzy. She makes everyone their own personal meals. Given that Izzy and Cecile are the only two beings on the ship who are the same species, she has to. There's some degree of difficulty to this.

While there are quite a few items from every planet that are able to be eaten by off-worlders, most aren't compatible with the enzymes of digestive systems of other planets. However, this can be managed via food editing. It's a process that allows for edible items to be made compatible while still retaining its flavor profile and original attributes. Doing so in a safe way requires deft skill. Particularly if you're working with older devices. Newer machines simplify the process to the point that just about any cook can do it and it can be done for larger quantities and greater variability per batch. 

Vasddoo has to make do with an older food editing machine but she's a master of her craft. She's never had any complaints.