Take off the skin of the salmon and cut in small cubes.
Drain the beans and add them to the foodprocessor or a bowl ( and use a handmixer). Add the salmon and 100 grams of spinach. Mix it all up but not too much, it's good to have some chunks of salmon in the burger. If you have dill, it's a good flavor to add to this recipe. Cut it finely and and add it to the mixture
Meanwhile start making the pesto by adding the capers, cheese,1 tbsp of olive oil and pepper and sea salt by taste.
Mix it all up and add a squeeze of lemon if you wish. Taste and add flavors you like most. Some like it more sour, others more salty. Just add more of the ingredients you want to taste most.
Cut the avocado in small cubes. Make 4 balls of the fish spinach mixture. Give them a little push with your hands to make them more flat, like burgers usually are.
Use a wide skillet and bring 1 tbsp of olive oil to a heat. Add the burgers and bake them until light brown on each side for about a total time of 10 minutes.
Cut the buns open and spread the pesto on each side of the buns. Add one burger to each bun and covers with more pesto, avocado and some leftover spinach. Serve with sweet potato chips! Enjoy!