What is the best way to thicken a light fruit syrup from preserved berries to make it stick, with the berries, as a topping on a cheesecake.

When I put up the berries, I gently cooked the berries with sugar using the "light syrup" method in the Ball Blue Book. In its current state, the syrup is too thin. Should I heat just the syrup with some cornstarch, and if so, how much per cup of syrup? Thanks so much. ;o)

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Reiney
Reiney April 28, 2012

The syrup would be thin owing the higher percentage of water, so you can just reduce it by simmering the liquid - no cornstarch needed.

Getting the right consistency takes some trial & error, because the sauce thickens as it cools. Boil it for a bit to reduce, allow it to cool, test it and boil again if too runny. If too thick, mix in a bit of water.

You can use cornstarch (not very much! and make sure to boil it if you do to cook out the starchy taste) but this method works just as well and may give a cleaner taste on the palate.

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LE BEC FIN
LE BEC FIN April 28, 2012

this is a beautifu answer but just want to add that the 'bring to boil' step is necessary to activate the cornstarch (or arrowroot etc.)

Esther Plume
Esther Plume April 28, 2012

Cornstarch will give you a cloudy finish, which isn't really a problem, but the usual thing to use is arrowroot powder, as it keeps the juice clear.

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Margaret Lowe
Margaret Lowe January 12, 2019

Spot on ,Ester Plume, arrowroot is the best as it keep the juice clear

Esther Plume
Esther Plume April 28, 2012

Sorry! Meant to say, if you use cornstarch, take a bit of the juice out, let it cool a bit and slake about a teaspoon in, then add that to the juice. You'll need to bring it to the boil to thicken it, you can always add more, it depends on how thick it is to start with.

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hardlikearmour
hardlikearmour April 28, 2012

I'd reduce it down in the microwave to minimize risk of burning as per Rose Levy Beranbaum's advice.

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boulangere
boulangere April 28, 2012

I'd suggest setting it with gelatin, as for a miroir. That way, you don't have to overcook the fruit or risk scorching anything. And the finish will have a lovely shine.

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AntoniaJames
AntoniaJames April 30, 2012

Thanks, everyone. I ended up draining the berries and simmering the syrup to reduce to about 1/4 of its original volume. It was a bit anemic, even when reduced, so I added a scant tablespoon of sugar and simmered until sort of syrupy. The berries were tart, small ones, so the syrup could tolerate just a bit more sugar. Then I added the syrup back to the berries, let it sit for an hour or so, then gave it a good stir and put it all on top of my "Corsican Ricotta Cheesecake", adapted from a Patricia Wells recipe. It worked perfectly! ;o)

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