A simple and environmentally friendly method for the preparation of composite cathode materials from cost-effective waste-product elemental sulfur and sustainable, nonhazardous vegetable oils is presented. High sulfur contents of up to 80 wt\% are achieved. Scanning electron microscopy reveals that the composite materials consist of micrometer sized sulfur particles which are embedded in a crosslinked polymeric network. The polymeric network formed upon copolymerization of the fatty acid residues and elemental sulfur is similar to factice. For the first time factice-like sulfur containing composites are utilized successfully as the active cathode material in Li-S batteries. Upon employment, high initial specific capacities up to 880 mAh g(-1), good capacity retention abilities (63\% after 100 cycles) as well as high coulombic efficiencies are achieved, suggesting reasonable suppression of polysulfide diffusion as a consequence of the embedment.