
2 (6-ounce) containers Greek low-fat yogurt
½ cup finely chopped seedless cucumber
2 green onions, thinly sliced
1 teaspoon grated lemon zest
1 tablespoon fresh lemon juice
2 tablespoons chopped fresh dill or 2 teaspoons dried dillweed
⅛ teaspoon kosher salt
1 untreated cedar or alder plank
2 tablespoons olive oil, divided
1 (3-pound) skin-on salmon fillet
1 medium lemon, cut into thin slices
1 medium lime, cut into thin slices
1 medium red onion, cut into thin slices
Salt and pepper, to taste
Fresh dill sprigs, optional