When Ukrainian chef Olia Hercules has a glut of overripe tomatoes, she likes to grate them with salt and use them to ferment other ­produce—in this case, cherry tomatoes, which become plump and almost ...

So many of us mourn the end of tomato season, as we turn any unripe fruit into the soil or toss it on the compost heap. Yet we are slowly discovering that green tomatoes are delicious, and not just ...