Pick through the salmon to remove bones and skin (Done because Thea would not even deign to smell them if there was a chance they contained skin and bones). Process the crackers to crumbs in your food processor. Process the onion to ‘fine’. Add everything together in a mixing bowl. Mix.
Now the tricky part. Empty the bowl onto wax paper and use the wax paper to roll it into a two inch diameter cylinder. Put that cylinder in your refrigerator and leave it alone for at least half an hour. All the ingredients need time to come together and the cold wax paper peels away easily. I used a sharp knife to cut the cylinder into patties. I came out with 12 half inch thick patties. I cut a few through the wax paper and did the rest after unrolling the wax paper. Both methods produced similar results. I just needed to tweak the shape a bit to get it back to full rounds.
Bake at 400°F for 15 minutes. Flip and bake an additional 10 minutes. I lined my baking sheet with parchment paper to make sure they didn’t stick.
I can easily see variations; add some parsley, use half an onion and half a bell pepper, add capers, etc.