Very interesting. I am new to this forum and I am planning a “shake down” of my own. Thanks for sharing your experience about yours.
You might find Malcolm Gladwell’s TED presentation very informative, particularly beginning at minutes 9:35 onward.
Go to TED.com and search for Malcolm Gladwell (his presentation about spaghetti sauce). Sorry I tried to link to it but the link management on this site seems hit or miss.
As it relates to the products of every vendor on this forum, there is no single best product. It simply doesn’t exist. You might consider field-testing and eventually offering a couple different types of burgers and fries (e.g. spicy and regular) to appeal to a broader audience.
Mind you, too much choice is as bad as too little. So be careful about providing too many choices. Barry Schwartz has an excellent presentation on the paradox of choice. While you are on the TED website search for Barry Schwartz to find it. I tried to link to it here but this forum seems to limit links.
Good luck to you…it sounds like you’re going about things in the right way.