Add the rest of the ingredients except 1/4 cup bread crumbs. Mix, mash, mix.
Taste and adjust salt if needed. Chill for 15 minutes so the mixture gets less sticky.
Make patties and coat in bread crumbs. I made 3 inch wide and 1/2-3/4 inch thick patties. The mixture might be sticky. Use flour or oil on hands to work. Once baked, the patties are quite sturdy.
(Use gf bread crumbs or coarsely ground Oats for glutenfree)
Bake for 25-30 minutes at 375 degrees F / 190ºc, until golden and dry on the outside.
Toast the buns/rolls lightly(optional)
Arrange Spinach on the buns, Top with a burger patty, Cucumbers, Dill Aioli, Fresh Dill and the top half of the bun.