Simple Raspberry Jam Recipe (2024)

FAQs

What is the ratio of sugar to berries when making jam? ›

(2)Most jam recipes call for a 1:1 ratio of fruit to sugar. I usually use a 75 % ratio, or 1 ½ pounds of sugar to every 2 pounds of fruit, unless the fruit is not very sweet, in which case, I adjust accordingly.

To ensure that my jam has a proper acid level to gel properly and limit bacteria growth, I always add lemon juice to a jam mixture. Plus, I like the flavor a pop of lemon juice adds to my jam. It balances the sweetness of the fruit and brightens most fruit jams.

Once the jam reaches a slow, thick boil, add lemon juice and continue to cook, stirring constantly until the jam returns to its earlier consistency, about another 5 minutes.

The ratio between fruit and sugar varies: with sweet fruits, it's about 2:1 (2 kilos of fruit, 1 of sugar), while with more bitter fruits like oranges, it should be more like 3:2. If uncertain, it's better to round up with the sugar. The other potential ingredients – lemon and pectin – are found in many jam recipes.

Jam recipes mostly comprise equal weights of fruit and sugar. You can play with this 1:1 ratio as much as you want, but too much fruit and you may lose the preserving effects of the sugar; too much sugar and it may crystallise during storage.

It's Not Only About Pectin

There's another reason why lemon juice is added to most jam recipes: for safe canning and to prevent the growth of bacteria. Bringing the pH level down means jars can be sealed in a regular boiling water bath in a reasonable amount of time (sometimes as little as 10 minutes).

If your recipe called for lemon juice and you forgot to put it in, your mixture will not be acid enough for safe canning. You have to open the jars and put the mixture into a sauce pan. (If you made the jam or jelly recently and you carefully remove the lids without damaging them, you can re-use the same lids.)

You can use bottled lemon juice or fresh. However, I personally look to use other complementary juices to certain fruit jams. Rather than rely on lemon juice I would for example use redcurrant juice from fresh redcurrants in a strawberry jam instead, or an acidic type of apple and apple juice in a blackberry jam etc.

Many classic preserve recipes call for equal amounts of fruit and sugar. However, I prefer a blend of 60 percent fruit and 40 percent sugar, by weight. A 60/40 blend includes enough sugar to preserve the fruit and aid in the jelling process, but allows the flavor of the fruit to come to the fore.

Does the amount of sugar matter when making jam? ›

In addition to sweetening and helping with gel formation in regular jams, jellies and preserves, sugar plays a very important role in preventing spoilage. The large amount of sugar present reduc- es the “available” moisture for microbial growth.

Top tips for making jam

As a guide, use a cup of sugar for every cup of chopped fruit. To set, jam needs the right balance of acid and pectin. High-acid fruits include citrus, cherries, green apples, pineapple, raspberries and plums.

Top tips for making jellies

These are clear jams without 'bits' in them, made by boiling strained fruit juice with sugar. They're best made with fruits high in pectin, though if your fruit isn't, combine with a fruit that is, like apples and gooseberries. To every 600ml of juice, add 450g sugar.