Stopping Toffee from Crystalising (2024)

FAQs

How to stop toffee from crystallizing? ›

To help prevent crystallisation, an acid/fructose such as lemon juice or cream of tartar can be added before boiling, or a glucose solution. This makes the molecules odd shapes and harder to form geometrical solid blocks. So it helps keep them separate, enabling a clear toffee.

Keeping the lid ajar will allow some steam to escape as the sugar continues to cook. Add a little acid (such as a touch of lemon juice) or corn syrup to the sugar-water mixture before cooking; they help interfere with crystallization.

It loses its moisture and turns back into a sugar crystal. If this crystal touches the melted mass, it causes a chain reaction and the caramel will seize up and become grainy. The easiest way to prevent crystallization is to avoid stirring the caramel. Instead, swirl the pan gently to help the sugar melt evenly.

It's important while the toffee cooks to only stir it occasionally. Constant stirring can cause the toffee to crystallize and separate.

As the toffee cools and the molten sugar crystals become solid again, they are attracted to the 'seed' forming new lumps of tiny crystals – hence the grainy texture. This can also happen if the toffee is stirred, or agitated, after it has begun to boil or on cooling (as happened with this pink-tinted toffee).

The acidic nature of lemon juice prevents the formation of sugar crystals. Just a small squeeze of lemon juice added to the sugar as it melts can make a big difference in the outcome of your caramel.

Crystallization may be prevented by adding an interferent, such as acid (lemon, vinegar, tartaric, etc.) or glucose or corn syrup, during the boiling procedure.

Commercially jellied products often contain corn syrup, which serves as an interfering agent to prevent crystallization. Only use corn syrup in recipes calling for it. Crystals form when the mixture is cooked too slowly, or too long. Cook jelly at a rapid boil.

If you don't want to buy invert sugar, a simple way to prevent crystallization is to “invert” the sucrose by adding an acid to the recipe. Acids such as lemon juice or cream of tartar cause sucrose to break up (or invert) into its two simpler components, fructose and glucose.

Add an acid: Adding an acid keeps sugar from recrystallizing by breaking down a portion of the sucrose molecules into fructose and glucose molecules. Our Caramel Sauce, for instance, includes cream of tartar as insurance against the sugar crystallizing.

Why add vinegar to caramel? ›

Add acid. Acid ingredients (like vinegar or lemon juice) can help prevent re-crystallization which causes caramel to become grainy. Acid physically breaks the bonds between the glucose and fructose molecules that form sucrose and ensure that it stays apart.

Don't hurry this gradual transformation; syrup that doesn't reach 300°F, or close to it, will make candy with timid flavor and chewy (not crunchy) texture.

This recipe includes a dash of vinegar which will help keep the colour of the toffee clear and bright and banish any cloudiness.

Use a spatula to spread softened chocolate into a thin, even layer. Sprinkle nuts over the chocolate and press down slightly; wearing a plastic bag over your hand will minimize the mess. Place toffee in the refrigerator until set, about 1 hour.

Don't hurry this gradual transformation; syrup that doesn't reach 300°F, or close to it, will make candy with timid flavor and chewy (not crunchy) texture. Think you can save time by bringing the syrup to a full rolling, popping boil in order for it to darken more quickly? Think again.