Chemical reactions involving 2 immiscible liquid reactants and solid catalyst particles are limited in their reactivity because the catalytic sites are typically not accessible to both reactants. However, by locating the catalyst particles at the interface of two immiscible reactants, all three participants meet and the reaction can proceed swiftly. Based on this concept, we employ colloidal particles at interfaces to structure liquids into a long network composed of microscopic channels, a material known as a bijel fiber. (fig. 1A) The large surface area of a bijel enhances the reactivity because it facilitates intimate contact between reactants and catalysts. Moreover, the two interwoven channel networks of oil and water allows reactants to flow in, and products to be continuously withdrawn. This approach shows promises to introduce a new chemical technology for the synthesis of high value-added chemicals. However, before industrial implementation can be realized, several research questions still need to be investigated.