Fruit, sugar, and vinegar left alone for a few days, producing the sharpest soft drink you will make all summer.
A shrub is a drinking vinegar. That description puts people off, which is a shame, because what you actually get is a syrup so bright and sour that it makes ordinary cordial taste flat. It was a preservation trick long before it was a cocktail ingredient, a way of holding onto soft fruit before refrigeration, and the flavour is a direct consequence of that job.
Strawberry and rhubarb is the natural pairing to start with. Rhubarb is already tart and slightly astringent, strawberries are sweet and floral, and vinegar sits underneath both and pulls them into focus. Below is the cold-process method, which takes patience rather than skill.
Key Takeaways
– A shrub is fruit, sugar, and vinegar, traditionally in roughly equal proportions by weight.
– The cold process gives a fresher, brighter result than heating, but takes several days.
– Rhubarb leaves are toxic and must never go in. Use the stalks only.
– Finished shrub keeps in the fridge for months and gets rounder as the vinegar edge softens.
– Serve it long with sparkling water at about one part shrub to five parts water.
What a Shrub Actually Is
SaveThe formula is simple: equal weights of fruit, sugar, and vinegar. The sugar draws juice out of the fruit by osmosis, the vinegar preserves it and provides the acidity, and time does the rest.
Your choice of vinegar matters more than anything else here. Apple cider vinegar is the standard and works well with both fruits, giving a soft, slightly appley background. White wine vinegar is cleaner and lets the strawberry come forward. Distilled white vinegar is too harsh for this. Whatever you choose, use one with around five per cent acidity, which covers most supermarket vinegars.
There is a modest body of research on vinegar and post-meal blood glucose, generally finding a small blunting effect on the glucose and insulin response to a carbohydrate-heavy meal. It is worth keeping perspective: a shrub is mostly sugar, and drinking one is not a blood sugar intervention. The vinegar is here because of what it does to the flavour and the shelf life.
What You Need
SaveMakes roughly 700ml of shrub.
250g strawberries, hulled and quartered
250g rhubarb stalks, trimmed and chopped into 1cm pieces
500g caster or granulated sugar
500ml apple cider vinegar
1 strip of orange peel, optional
4 black peppercorns, optional
Use rhubarb with good colour if you can find it, because the finished shrub takes its pink almost entirely from the stalks and the strawberries. Green field rhubarb tastes fine but produces a murky brown syrup.
One safety point that is genuinely important: rhubarb leaves contain oxalic acid at levels high enough to be poisonous, and they should be cut off and discarded. Only the stalks are edible.
How to Make It
Save1. Put the chopped strawberries and rhubarb in a large bowl or wide jar and tip the sugar over them.
2. Stir well, cover, and leave at room temperature for 2 hours, then refrigerate.
3. Over the next 2 days, stir once or twice a day. The sugar will draw the juice out and gradually dissolve into a thick, dark syrup. By the end there should be very little dry sugar left and the fruit will look pale and collapsed.
4. Strain through a fine sieve into a jug, pressing gently on the solids. Do not force every last drop through or the shrub turns cloudy.
5. Add the vinegar to the strained syrup, along with the orange peel and peppercorns if you are using them. Stir until any remaining sugar dissolves.
6. Pour into a clean bottle or jar, seal, and refrigerate.
7. Leave it at least 3 days before drinking, and ideally a week. Straight after mixing, the vinegar is aggressive and sits apart from the fruit. Time integrates them.
Taste it at the one-week mark and again at three. It genuinely improves. If it is too sharp for you even after resting, stir in a little more sugar; if it is too sweet, a splash more vinegar will pull it back.
The leftover strained fruit is not waste. It is intensely flavoured and works stirred through yoghurt or spooned over ice cream.
How to Drink It
SaveThe default serve is long and cold: about 30ml of shrub topped with 150ml of sparkling water over plenty of ice, which is roughly one to five. Adjust from there. Some shrubs want one to four, some one to six, depending on how much sugar your fruit brought with it.
It also works stirred into still water, poured over ice cream, or used as the acid component in a cocktail in place of citrus. In a gin or whiskey drink it does the job lemon juice would, with considerably more depth.
Keep it in the fridge. The combination of high sugar and acidity makes it a poor environment for spoilage, and a sealed bottle will comfortably last several months. Expect the colour to deepen and the flavour to round out over that time.
The Bottom Line
A shrub asks for very little skill and a few days of patience, and gives back a cordial with more character than anything you can buy. Use rhubarb stalks only, pick a vinegar you would happily smell, and resist drinking it the day you make it. The week it spends in the fridge is doing the most important part of the work.
This article is for informational purposes only and is not a substitute for professional medical advice. Talk to your doctor or a registered dietitian before making significant changes to your diet, especially if you have a health condition or a known food allergy.