Pectin stock from trimmings

What it is good for

Trimmings from high-pectin fruit are the cheapest pectin available to a small kitchen, and they are free in the literal sense that you were going to throw them away. The useful framing is that this is a way to rescue a low-pectin fruit rather than a way to avoid buying pectin in general.

• Setting a low-pectin fruit without buying commercial pectin.
• Rescuing a batch that is reading short on set, before resorting to a longer cook.
• Using trimmings from a fruit you are already processing, in the same session.

Where it comes from

Not all trimmings are worth keeping and the difference is large. Knowing which fruit repays this saves a pan of simmering water producing very little.

Apple cores and peel, crab apples, citrus peel and pith. Underripe fruit of any kind, because pectin falls as fruit ripens, which is the same reason jelly wants a quarter of its fruit underripe.

What it does not replace

A commercial pectin, if you need a predictable set in a product you are selling. A home-made stock varies with what went into it, and variability is the thing a repeatable product cannot have. It is a tool for a small-batch maker, not a specification.

The honest limit

This will not substitute for commercial pectin in a recipe written around it, and treating it as a drop-in replacement is how a batch ends up thin. The strength varies with the fruit and with how long you simmered it, and nothing on the stove tells you which you have. Use it to help a fruit that needs help, and test the set rather than trusting the quantity.

If you are relying on added pectin for the set, the trimmings are back to being trimmings and keeping them in the pot adds bitterness for no structural return.

References