"It is surprising that this is the first scientific research on the benefit of a hot drink for treating cold and flu symptoms," the Telegraph quoted Professor Ron Eccles, the director of Cardiff University's Common Cold Centre, where the study was carried out, as saying.
"With temperatures falling and Christmas just round the corner, cold viruses love this time of year.
"Having a bottle of fruit cordial in the cupboard and making a hot drink could help fight off the symptoms of festive cold and flu.
"The big advantage of this type of treatment is that it is cheap as well as safe and effective," Eccles added.
The researchers found that "a simple hot drink of fruit cordial can provide immediate and sustained relief from symptoms of runny nose, cough, sneezing, sore throat, chilliness and tiredness".
For the study, researchers compared the effects of drinking an apple and blackcurrant cordial either hot or at room temperature among 30 volunteers with common cold symptoms.
Now, the researchers believe that cold and flu sufferers should have a hot drink to help reduce their symptoms.
The study is published in the journal Rhinology.