Amidst the bitter fog of winter, development of the Project19 gas-torch igniter has been underway. The igniter combusts gaseous propellants to provide and extremely hot gas jet to produce an ignition source to ignite the main combustion chamber.
You can see footage of a preliminary ignition test here:
The gas-touch only runs for a fraction of a second before the main propellants ignite. The torch is uncooled because of its short run-cycle. The bubbling you can see is some coolant fluid sprayed onto the torch between prototype testing.