Go for it! You have to puree everything up anyway so why not?
The only thing is, as you probably know, it's a good idea to start with one food at a time and not introduce a new food for couple of days at least. Also, your first food should be something bland like rice cereal or mashed pumpkin. Can't see why, after a few days, you shouldn't puree in some cooked broccoli with the pumpkin, potato or whatever you try.
Feliss