Thanks Dick,
The burner is definitely on my list of things to clean or repair. I came across the following site which contains some useful information.
https://www.arprv.com/dometic-fridge-flame.php
I can tell you my flame looks nothing like the flame shown on the web site referenced. I can also say that I now know my igniter is too far in the flame instead of beside the flame. The site also recommends cleaning the flue.