Coffee connoisseurs have identified a simple, unlikely ingredient that can transform your morning cup: salt. According to experts at America's Test Kitchen and Perfect Daily Grind, adding a pinch of salt to coffee grounds before brewing reduces bitterness and brings out natural sweetness, resulting in a smoother, more balanced flavour.
Why Salt Works in Coffee
Sodium ions in salt block the perception of bitterness on the tongue, a principle well-documented in food science. Sara Marquart, former head of flavour at The Coffee Excellence Center, explained: "The addition of salt in coffee dampens bitterness without using other additives. Salt naturally brings out the sweetness of coffee and maintains pleasant aromas. If people are sensitive to bitterness, even in specialty coffee, adding salt is a good alternative to using milk and sugar."
Perfect Daily Grind further notes that salt helps "balance the flavour profile of bitter robusta coffees and coffees with very dark roast profiles."
The Alton Brown Trick
The hack gained widespread attention in 2009 when food science expert Alton Brown demonstrated it on an episode of Good Eats. He recommended adding half a teaspoon of salt for every cup of water and two teaspoons of ground coffee. Brown stated: "Not only does salt cut the bitterness, it also smooths out the stale taste of tank-stored water. Research has proven that salt is actually better at neutralising bitterness than sugar."
Though Brown didn't invent the method, he popularised it, and many coffee lovers still refer to it as "the Alton Brown trick."
Public Reaction and Alternatives
The tip has sparked mixed reactions online. A TikTok user commented "Interesting," while another noted "Works in beer too." A third shared their own alternative: "I add a sprinkle of cardamom to my morning coffee. It takes away any bitterness."
For those sensitive to bitterness, adding a small pinch of salt to coffee grounds before brewing—or directly into the finished cup—can be a simple, cost-free way to enhance flavour without resorting to milk or sugar.
