Salad greens definitely return great value for space. And also better food and taste value than buying em by the head, I have mizuna, komatsuna, arugula as well as lettuce, bok choy, and the sky's the limit for variety in the home patch.
Peppers are a decent value for the space required - especially since they are expensive here.
Potatoes are a great value for time invested if you have plenty of space: basically three days work: sowing, trenching and harvesting.
Tomatoes... can't be evaluated, since you can't buy a real tomato at any price!
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