Bombay Sliders With Garlic Curry Sauce

Name: Bombay Sliders With Garlic Curry Sauce
Ingredients: 1 cup mayonnaise, divided; 6 1/4 teaspoons curry powder, divided; 1 1/2 tablespoons plain yogurt; 1 1/2 tablespoons ketchup; 1 garlic clove, minced; 2 pounds ground turkey; 6 tablespoons chopped fresh cilantro; 1/4 cup minced green onions; 2 tablespoons minced peeled fresh ginger; 2 teaspoons ground cumin; 3/4 teaspoon hot chili powder or Hungarian hot paprika; 1 teaspoon salt; 1 tablespoon olive oil; 12 small dinner rolls, cut horizontally in half, lightly toasted