I whisk olive oil, fresh lemon juice, Dijon mustard, chopped dill, salt, and pepper in a medium bowl. The mustard helps emulsify it into a silky dressing. I taste it right away—sometimes I add a drop more lemon for brightness or more dill for that fresh herbal lift.
While the dressing rests, I gently spin-dry the mixed greens so they're crisp but not dry as cardboard. I layer them in a large bowl, then add the sliced cucumbers and red onions. These veggies bring crunch and mild sweetness that I love.
Now comes my favorite part: draping thin ribbons of smoked salmon over the greens. I tuck in the sliced eggs and avocado for creamy richness. I slice the avocado last to keep it from browning.
I drizzle the dressing over the assembled salad moments before serving. Then I give everything a gentle toss—just enough to coat but not mash the avocado. The salad shines freshest this way, keeping textures and flavors lively.