Step 1: Prepare the Salmon. Start by gently flaking or finely chopping your skinless salmon fillets. Transfer the salmon to a large mixing bowl.
Step 2: Mix the Meatball Ingredients. To the salmon, add the breadcrumbs, the lightly beaten egg, finely chopped fresh dill, minced garlic, lemon zest, Dijon mustard, salt, and black pepper. Mix everything gently with your hands until just combined.
Step 3: Form the Meatballs. Take about a tablespoon of the mixture and gently roll it into small balls, about 1 to 1.5 inches in diameter. Place the formed meatballs on a plate or baking sheet.
Step 4: Cook the Salmon Meatballs. Heat 2 tablespoons of olive oil in a large non-stick skillet over medium heat. Carefully place the meatballs into the pan, ensuring not to overcrowd. Cook for 3-4 minutes per side, turning gently, until golden brown and cooked through. Transfer to a paper towel-lined plate.
Step 5: Prepare the Avocado Crema. In a blender or food processor, combine the pitted and scooped ripe avocados, chopped fresh cilantro, lime juice, minced garlic, and Greek yogurt (if using). Start with 2 tablespoons of water or milk and blend until smooth and creamy. Add more liquid if needed, one tablespoon at a time, until desired consistency is reached. Season generously with salt and pepper to taste.
Step 6: Serve and Enjoy! Arrange the warm salmon meatballs on plates. Drizzle generously with the freshly made avocado crema. Garnish with a little extra fresh dill or cilantro, and a wedge of lime. Serve immediately.