Disclosed are a method and a corresponding apparatus for converting a 
biomass reactant into synthesis gas. The method includes the steps of (1) heating 
biomass in a first molten liquid bath at a first temperature, wherein the first temperature is at least about 100° C., but less than the 
decomposition temperature of the 
biomass, wherein gas comprising water is evaporated and air is pressed from the biomass, thereby yielding dried biomass with minimal 
air content. (2) Recapturing the 
moisture evaporated from the biomass in step 1 for use in the process gas. (3) Heating the dried biomass in a second molten liquid bath at a second temperature, wherein the second temperature is sufficiently high to cause flash 
pyrolysis of the dried biomass, thereby yielding product gases, 
tar, and 
char. (4) Inserting recaptured steam into the process gas, which may optionally include external 
natural gas or 
hydrogen gas or recycled 
syngas for mixing and reforming with 
tar and non-condensable gases. (5) Further reacting the product gases, 
tar, and 
char with the process gas within a third molten liquid bath at a third temperature which is equal to or greater than the second temperature within the second molten liquid bath, thereby yielding high quality and relatively clean synthesis gas after a relatively long 
residence time needed for 
char gasification. A portion of the synthesis gas so formed is combusted to heat the first, second, and third molten liquid baths, unless external natural or 
hydrogen gas is available for this use.