A burner nozzle for depositing soot on a glassware mold includes an inner member and an outer member surrounding at least a downstream portion of the inner member. A first gas passage extends through the inner member for delivering a fuel gas to at least a single outlet port from the inner member. A second gas passage extends between the inner and outer members in an annulus surrounding the first passage for delivering a second gas through the annulus to at least one second outlet port. The first and second outlet ports preferably form an annular composite array in which the first and second outlet ports alternate with each other. The second plurality of ports preferably comprise slots having long dimensions radial to the annular array. The first plurality of outlet ports preferably are circular.