Solid foods... with chunks

We have just started giving CJ baby food w/ fresh food mixed in... For example: I gave him Gerber bananas today w/ mushed fresh banana in it. For some reason, every time I give him fresh food mashed up, he chokes... He seems to try to swallow pieces whole, then choke them back up, chew a bit and swallow again. Is that normal? Will he naturally learn how to do this better or should I be waiting to add "chunkier" foods to his diet...? The other thing I've tried is avocados, same reaction. Any ideas?...