What is sumac and what role does it play in zero-proof drinks?
Sumac (Rhus coriaria) is a Middle Eastern spice ground from the dried berries of the sumac shrub, delivering a sharp, sour-fruity acidity with tannin depth and a faint earthy-floral complexity. In zero-proof drinks, it functions as a natural souring agent, an astringency balancer, and a visual colourant — its deep burgundy-red is striking in sparkling water infusions, shrubs, and mocktail syrups without requiring artificial dyes.
Sumac's sourness comes from malic acid, tartaric acid, and citric acid in combination — a more complex acid profile than lemon juice (predominantly citric) or tamarind (predominantly tartaric). The pH of sumac-infused water ranges 2.9–3.4 depending on concentration, comparable to kombucha. It also contains tannins (gallotannins, specifically), which add astringency and a dry, grippy mouthfeel. This combination of acidity and tannin is precisely what makes sumac interesting: it approximates some of the structural qualities of wine without any of the alcohol.
Historically, sumac was used as a souring agent before lemons became widely available in the ancient world — it was the lemon juice of the Roman and Byzantine kitchen. The Levantine tradition of sumac-infused water (sharab al-summaq) is essentially an ancient proto-shrub: berries steeped in cold water overnight, strained and sweetened. Modern bartenders have rediscovered this as a zero-proof acid source that brings colour, complexity, and story to a drink.
Culinary chemistry note: sumac's tannins interact with proteins and polysaccharides, meaning it can affect texture in drinks containing dairy alternatives, nut milks, or egg white foams. In a sumac foam, the tannins partially denature the protein, creating a more stable foam with a subtle grip — a technique used by some zero-proof fine-dining programmes.
| Property | Sumac | Lemon juice | Tamarind |
|---|---|---|---|
| Primary acid | Malic + tartaric + citric | Citric (dominant) | Tartaric (dominant) |
| pH range (drink application) | 2.9–3.4 | 2.0–2.5 | 2.5–3.0 |
| Astringency | Medium-high (gallotannins) | Low | Low-medium |
| Colour contribution | Deep burgundy-red | Clear/pale yellow | Brown |
Sumac features in the zeroproof.one ingredient guide on Middle Eastern and Mediterranean botanicals — including usage ratios for shrubs, syrups, and infused sparkling waters.