Portable single burner propane cooktop?

I don't have a suggestion to a product but I do have two portable dual burner cook tops and a Coleman griddle affair. All of them work well for cooking. The Coleman is especially good at cooking sausage or hot dogs as the cast iron top can be flipped to it's ridged side. It has wings built into the top ala' the old gasoline Coleman camp stove to block drafts.

Really, any small gas ring would do the job. The elegance is all in the case mounting, pan grid, and valve arrangement. Good luck on finding a worthwhile stove top. I would suggest that if you find one with a cast iron ring, the longevity will be longer.