Just because you have a PEG this does not mean that you have to use the canned food exclusively, at least not initially.
Using a mixer you can make vegetables and past small enough so that it passes through the PEG. (using a 50 cc syringe). Just make sure you do not clog the PEG otherwise there will be a big mess. Also using a syringe you can get 50 ml into the stomach very quickly, you need to watch this so that it is not uncomfortable, especially with respect to temperature.

M