Chicken Skewers with Meyer Lemon Salsa

Name: Chicken Skewers with Meyer Lemon Salsa
Ingredients: 8 Meyer lemons; 1/2 cup finely chopped English hothouse cucumber; 3 tablespoons thinly sliced scallions, divided; 1 serrano chile (with seeds), finely chopped; Pinch of sugar; Kosher salt; 1 1/2 pounds skinless, boneless chicken thighs, cut into 1 1/2” pieces; Freshly ground black pepper; 1/4 cup plus 2 Tbsp. chopped fresh cilantro; 1/4 cup plain whole-milk yogurt; 1 tablespoon vegetable oil; 2 garlic cloves, coarsely chopped; 1 teaspoon cracked coriander seeds; 1 teaspoon turmeric (optional)