Make the dressing by whisking together the apple cider vinegar (2 tablespoons), dijon (1 tablespoon), lemon juice (1 tablespoon), water (1 tablespoon), maple syrup (1/2 teaspoon), garlic (2 clove), oregano (1 teaspoon), salt (1/2 teaspoon), and pepper (pinch). Slowly add the olive oil (1/4 cup) as you whisk. Set aside.
Dab salmon filets (2) completely dry, and season both sides with salt and pepper. Press to adhere. Heat avocado oil in a large pan over medium-high heat. Once the oil starts to shimmer, add the salmon, skin side down. Cook until the skin no longer sticks to the pan, flips easily, and is crispy--about 4-5 minutes. Flip and cook on the second side until the salmon is cooked through, should be another 4-5 minutes.
In a large bowl, combine the romaine (4 cups), onions (1/4 cup), tomatoes (1/2 cup), and cucumbers (1/2 cup). Pour dressing on top and toss to combine.
Divide the salad between 2 bowls. Top salad with salmon, avocado (1/2), feta (1/4 cup), and kalamata olives (1/4 cup). Enjoy!