Chicken Tikka with Cucumber Raita

Name: Chicken Tikka with Cucumber Raita
Ingredients: 2 1/4 pounds boneless, skinless chicken breasts, cut into 1 1/2-inch cubes; 3 garlic cloves, minced; 5 teaspoons minced fresh ginger; 1 1/2 teaspoons salt; 3/4 cup plain whole-milk yogurt; 1/2 cup vegetable oil mixed with 1 tablespoon Chinese mustard; 2 tablespoons fresh lemon juice; 2 teaspoons ground cumin; 1 teaspoon ground mace; 1 teaspoon ground nutmeg; 1 teaspoon ground cardamom; 1 teaspoon turmeric; 1 teaspoon cayenne pepper; 1 teaspoon freshly ground black pepper; Vegetable oil, for the grill; Lemon wedges, thinly sliced red onion and chopped cilantro, for serving; Cucumber Raita