Few trees carry as much quiet weight in the British countryside as the rowan. Its berries ripen to a startling scarlet just as the year begins to turn, and for centuries they have been gathered, strung, cooked and preserved by people who knew exactly what to do with them. A pot of rowan jelly is one of autumn's finest small achievements: sharp, clear, amber-red and astonishingly good with venison, pheasant or a wedge of crumbly cheese.

The Rowan in British Folklore

The rowan, often called the mountain ash, is not an ash at all, though the resemblance of its pinnate leaves is easy to understand. In Scotland, Wales, Ireland and the north of England it was planted beside cottage doors, byres and gateways as a protective tree. A rowan cross, bound with red thread, would be hung above a doorway or sewn into a child's coat, and the old rhyme about rowan tree and red thread keeping witches at bay was repeated in many a household.

To fell a rowan without good reason was considered unlucky, and in some districts the tree was treated almost as a guardian of the household. The berries themselves were used in charms, in divination and occasionally in folk medicine. You do not need to believe any of it to feel that sense of ceremony when you fill a basket with them on a cold, bright morning.

Foraging Rowan Berries in Autumn

Rowan berries are ready from late August through to October, depending on where you are. They hang in flat-topped clusters of small, round, orange-red fruit, and they are at their best after the first frost, which softens their astringency. If the frost has not arrived, simply pick them and put them in the freezer overnight.

• Look along upland lanes, field edges, churchyards and the fringes of woodland. Rowan tolerates poor, thin soil and often grows where little else will.
• Pick whole clusters rather than individual berries. Snip the stalk with scissors and strip the berries at home; it saves an enormous amount of fiddling.
• Take only what you need. Redwings and fieldfares depend on these berries through the winter, and a tree stripped bare is a small tragedy.
• Avoid trees beside busy roads or anywhere spraying is likely. Wash the berries well before use.
• Check your identification carefully. Rowan berries are small, orange-red and held in flat clusters, with fern-like leaves of paired, serrated leaflets.

Why Rowan Jelly Rather Than Jam

Rowan berries are bitter, dry and seedy. Eaten raw in quantity they are unpleasant, and they contain parasorbic acid, which is largely driven off by cooking, so always cook them thoroughly. Their seeds and pith make a poor jam, but their high acidity and generous natural pectin make an excellent jelly.

Partnered with sharp apples, the berries set beautifully and give a jelly of glowing colour and a clean, tart, faintly bitter edge. That bitterness is the whole point. It cuts through rich meat in a way that sweeter preserves simply cannot.

The Traditional Rowan Jelly Recipe

This makes roughly four to five medium jars. You will need a large preserving pan, a jelly bag or a clean muslin square, and sterilised jars.

• 1kg rowan berries, stripped from their stalks and rinsed
• 1kg sharp apples, such as Bramleys or crab apples, roughly chopped, skin and cores included
• About 1.2 litres water, enough to just cover the fruit
• 450g granulated sugar for every 600ml of strained juice
• Juice of one lemon

• Put the berries and chopped apples in the pan and add the water. Bring slowly to a simmer.
• Cook gently for 40 to 45 minutes, until the fruit is soft and collapsing. Mash it occasionally with a potato masher to release the juice.
• Tip everything into a scalded jelly bag or a muslin square tied over a bowl. Leave it to drip overnight. Do not squeeze the bag, or the jelly will turn cloudy.
• Measure the strained juice back into the cleaned pan. Add the lemon juice and the sugar, allowing 450g for each 600ml.
• Warm gently, stirring, until every grain of sugar has dissolved. Do not let it boil before this point.
• Bring to a rolling boil and cook for 10 to 15 minutes, until setting point is reached.
• Skim off any scum, then pour into warm sterilised jars and seal while hot.

Setting Point and Potting Up

Setting point is around 105°C on a jam thermometer, but the wrinkle test is just as reliable. Chill a saucer in the freezer, drop a teaspoon of jelly onto it, let it cool for a minute, then push it with your finger. If the surface wrinkles, it is ready. If it merely runs, boil for another three minutes and test again.

Sterilise your jars by washing them and drying them in a low oven for ten minutes, then fill them while both jars and jelly are hot. Cover with a wax disc and a lid, and label once cool. Stored in a cool, dark cupboard, rowan jelly keeps its colour and flavour for at least a year.

What to Serve With Rowan Jelly

This is a jelly built for the autumn and winter table. Serve it with roast venison, pheasant, grouse or pigeon, and let it melt into the gravy. It is superb with cold meats, pork pies and good sausages, and it earns its place on a cheeseboard alongside Wensleydale, Cheshire, Lancashire or a sharp blue.

A spoonful stirred into a casserole or brushed over a joint of pork before roasting works wonders. Small jars, tied with a scrap of ribbon and a handwritten label, make a generous gift. Make a batch while the rowans are heavy on the branch, and you will have a little of that old protective magic sitting in the larder all winter.