Salmon With Whole Lemon Dressing

Ingredients

• 2 lemons, seeds removed, peel, pith and fruit finely chopped
• 1 small shallot or garlic clove, finely chopped
• 3 oregano, marjoram or thyme sprigs, leaves stripped and chopped
• 2 tablespoons white wine vinegar
• kosher salt and freshly ground black pepper
• 1/4 cup olive oil, plus more for drizzling
• 1 1/2 pounds skin-on salmon fillet
• 1 head butter or little gem lettuce, torn into large pieces
• 2 persian cucumbers or radishes, or both, sliced, for serving