First, toast the sesame seeds in a dry pan just until they begin to brown and smell nutty. Remove to a plate until ready to use.
In a food processor, combine 2/3 of the beans (not 2/3 cup, just 2/3 of the total amount), white or yellow onion, garlic, sesame seeds, salt, and pepper. Pulse until well combined, like a thick paste. Remove to a medium size mixing bowl.
Stir in the remaining beans and the bread crumbs. Cover and refrigerate for at least 30 minutes, up to overnight. Divide into four patties and either prepare to bake, or wrap in plastic wrap and refrigerate for future use. If you don’t plan to use the patties within the next few days, you could also freeze them.
When you’re ready to bake, lightly coat a baking sheet with oil and bake at 375°F for 18-20 minutes, flipping halfway. You could also pan fry these in a little oil. But I like baking as it frees you up to work on the onions for this recipe.
For the onions, chop the ends off the red onion, cut in half, and then slice into thin straws. On a shallow plate, whisk together the eggs and water (using a fork here is easier than a whisk). On another shallow plate, combine the flour and spices and give that a gentle stir so it’s well distributed. Now dip the onions in the egg mixture and then into the flour mixture. Once you have all the onions breaded, you are ready to fry. Heat the oil to around 350°F or just under. Fry the onions for about 30-45 seconds until golden brown (like in the photos). Remove to a plate lined with paper towels to remove excess oil.I like to use metal tongs when frying as it can be easier to move food to and from the hot oil. Toast a few burger buns and add your baked burger patties, lettuce, cheese, tomato, etc. as well as the warm onion straws.