Post strength training snack -vegetarian

Hi,

I'm starting a strength training programme and my trainer said to eat something high in protein after a workout. I'm a vegetarian. He suggested chocolate milk, a shake, a protein bar.
However I try not to eat processed food (although i do on occasion) but this would mean eating something processed 3 times a week after training every week. I just don't see how this could be healthy??
Can anyone suggest a post workout snack that would tick the boxes of protein/carbs etc, but not be processed. I wouldn't mind having a choc milk or a bar once a week but definitely not 3 times.

Thanks in advance