A system and method for producing multiple syngas products. In one embodiment (FIG. 5) a syngas producing system (200) includes a gasifier (210) and a hydrocarbon steam reformer (226). The gasifier (210) is configured to react a solid or liquid carbonaceous material (212) and provide a first syngas product (222). The reformer (226) is coupled to receive sensible heat from the first syngas product (222) and drive an endothermic reaction in which a second syngas product (238) is produced from a liquid or gaseous hydrocarbon supply (150). In a method of processing fuel, a solid or liquid carbonaceous material (212) is provided to a gasifier (210) in the form of a slurry, which is converted into a first syngas product (222) in an exothermic reaction. A liquid or gaseous hydrocarbon supply (150) receives sufficient sensible heat generated during the exothermic reaction to convert the liquid or gaseous hydrocarbon supply (150) into a second syngas product (238).