Prepare all salad ingredients by chopping into uniform, bite-sized pieces.
In a jar or small bowl, combine all dressing ingredients and whisk or shake until emulsified.
Taste and adjust with extra salt, pepper, or lemon juice as needed.
Add the prepared salad ingredients to a large mixing bowl in the order listed: cucumbers first, then tomatoes, olives, cheese, shallot, avocado, lettuce, parsley. This layering stategy helps ensure even tossing without crushing softer items or making the greens soggy.
Drizzle the dressing evenly over the salad. Toss thoroughly so all pieces are well coated and every forkful gets flavor. Serve immediately.