The ketchup hovers on top and just glides out of the bottle.
According to Prof Kripa Varanasi, who developed the slippery surface, the technology is completely safe.
"The cool thing about it is that because the coating is a composite of solid and liquid, it can be tailored to the product. So for food, we make the coating out of food-based materials and so you can actually eat it."
The technology's co-inventor Dr David Smith told me that it could also help reduce waste.