I didn't grow much in pots, but until this year when I got the plot, I could only grow in 1 pot and 1 hanging basket in the back garden.

So I used to put 3 tumbler cherry tomato plants in the hanging basket (which works very well - cropped for about 8 weeks and toddler was getting 6/7 daily as well as a few for us). I have heard this year that a basil plant in the basket is nice - both for the height and to mix with the tomatoes for eating.

I also grew peas (occasionally mixed with french beans) up a wigwam of bamboo poles - while not terribly prolific, there was usually enough to get a nice handful either for a spoonful each or to add to a mixed veg stirfry maybe once or twice a week for about 6-8 weeks. If you are careful choosing your variety and put plenty of seeds in the tub, then you could get a better yield.

Just remember to water well as containers dry out quicker than the soil. And I usually give them a liquid tomato feed every week-10 days.