A bunch of frosty frozen red grapes on a cutting board - Carmen Troesser ... Once they're as dry as they'd be sun-kissed on the vine, arrange a single layer on a parchment paper-lined baking ...

The next time you buy a bunch of red (officially black) grapes, peel off the skin and you will see that the flesh is almost colourless. Red wine gets its colour from a pigment known as anthocyanin ...

And frozen grapes are primary among them. While you can literally just throw a bunch of grapes in the freezer ... as dry as they'd be sun-kissed on the vine, arrange a single layer on a parchment ...