The meaning of the entire phrase means "among the very sour fruits."

People are sweet and sour fruit together, wherever you find them.

The town is also known for "Kotha", a kind of sour fruit like fig.

They can be made from almost any fruit, though sour and bitter fruits are especially prized.

His eyes widened and he spat out the sour fruit.

It's something on the order of the way sour fruit makes your mouth pucker up.

Odd that the sourest fruit was the first to be plucked.

Birds adore the sour seedy fruit, so you might as well leave it for them.

I popped a chunk of sour fruit into my mouth.

The pleasantly sour fruit are also eaten fresh or cooked.