Preheat your oven to 400 degrees Fahrenheit and line a baking sheet with parchment paper.
Dice the salmon fillets into very small, uniform pieces using a sharp knife.
In a large bowl, gently combine the salmon, breadcrumbs, fresh dill, lemon zest, and a pinch of salt.
Using damp hands, form the salmon mixture into golf-ball-sized spheres.
Place the meatballs on the baking sheet and bake for 15 minutes, or until the internal temperature reaches 145 degrees Fahrenheit.
While baking, combine avocado flesh, Greek yogurt, minced garlic, and lemon juice in a food processor.
Blend on high speed until a smooth and velvety consistency is achieved.
Transfer the sauce to a bowl and drizzle generously over the baked salmon meatballs before serving.