I tend to shy away from the one and done crops, like carrots and radishes. Both are easy to grow, but it doesn't feel like the harvest has much payoff.
From the examples of a radish and a carrot I think the OP means one seed = one thing to eat. I don't think you can eat radish or carrot tops, but maybe you can. And you can't harvest them more than once like you can with a tomato plant or fruit tree.What is a one and done crop? I don't think I've heard that one before.