Preheat your oven to 250C.
Cut the eggplant in half, place it on an oven tray and brush it with olive oil. Sprinkle some salt and pepper on top and roast it in the oven for 20 minutes.
When it's ready, scoop out the insides and put them into a food processor or a bowl. If you don't have a food processor or a blender, you can simply mash everything by hand. Add the rest of the ingredients for the eggplant burger patties and process/mash together.
If you want the burger patties to be easier to shape, leave the composition to rest in the fridge for at least half an hour.
Heat some oil in a large, non-stick pan and add the patties, one by one. Lightly fry them on both sides, until they get a nice crust. Move them on a paper towel.
Assemble the eggplant burgers. Spread a layer of vegan aioli or mayonnaise on the halved buns (you can also use eggplant caviar, see the recipe link in the ingredients list). Add arugula or lettuce, some tomato and pickles slices, the eggplant burger patty and that's it! Enjoy a delicious vegan eggplant burger!